(PcGamer did this, not me, just putting that out here now)

To enable these, just hit the Tilde (`) key and enter the appropriate codes. You can turn on more than one at once, too, so you can be invincible, fly and teleport all at the same time. In the game, of course.
Some of these commands require codes, thankfully we've compiled a list of those too. Just grab the desired number from our Skyrim item codes or Skyrim NPC codes posts.
Some of these may cause glitches and/or you to fall out of the gameworld. It's definitely worth saving your game, and turning off autosave so you don't get indefinitely stuck in the non-space underneath Windhelm.
Console Commands
tgm
Good ol' God Mode means you're completely invulnerable to everything, and pretty damn god-like. And no one needs to write a book about you or anything.
tcl
No clipping lets you go literally anywhere in the game world, from the top of the sky to the bottom of the, er, sky. Fascinating if you want to witness the game world.
unlock
Can't find that vital key? Lockpicking skill too low? Simply highlight the door or chest you want to unlock, and type "unlock" into the console. If only this worked in real life.
psb
Every single spell in Skyrim is now yours!
player.advlevel
Automatically level up - perfect if you hate playing games.
caqs
Automatically complete all the stages of your primary quest - perfect if you hate playing games.
showracemenu
Unhappy with your blind, inbred-looking Bosmer chap? You can adjust the way your character looks just like you did at the start of Skyrim - but this will reset your level and skills.
player.modav skill X
Where "skill" is the skill you want to modify, and X is the amount you want to modify it by. Skills are inputted via their in-game names without spaces, apart from Archery which is "Marksman", and Speech, which is known as "Speechcraft".
player.additem ITEM ###
Every single item in Skyrim has a code, a bit like an Argos catalogue of fantasy objects. You'll find them in our list of Skyrim item codes (link pending) - replace "ITEM" with the item's code, and "###" with the number of items you want. Now your dreams of owning 47 cabbage potato soups can come true. You can find the codes in our Skyrim item codes post.
player.additem 0000000f ###
A simple way to get some free gold - any number between 001 and 999 will do.
player.additem 0000000a “###”
Running low on lockpicks? Enter the number you require here and they'll magically appear.
addshout
Combine with the codes on this Wikia page to add your selected shout.
tm
Toggles all in-game menus - perfect if you want to take some screenshots to convince elderly relatives that Skyrim is where you went on your holidays. Note that this also turns off the Console commands menu, meaning you'll have to type it again invisibly to be able to see what you're doing.
tmm
Followed by 0 or 1 turns map markers on or off.
tfc
Not Team Fortress Classic, unfortunately. However, you will be able to access the flycam and pretend to be a dragon. This is how everyone gets all those amazing Skyrim shots you've seen.
tai
Toggles AI, which means people won't interact with you, or do anything at all.
tcai
Turns combat AI on or off, turning dragons into placid beasts who act like you aren't there. A bit like cats.
tdetect
This one lets you behave like a little rapscallion, as it turns naughty business detection (stealing, murdering, doing a poo in the woods etc) on or off. You'll still get caught if you try pickpocketing, though.
player.setcrimegold ###
Adjust your wanted level with this handy command - setting it to zero resets your current amount of wantedness.
player.setlevel ##
Up or down your player level as you see fit. Perfect if you hate playing games.
player.setav speedmult ###
Want to run like Uwe Boll after a night on the vindaloo? Set this number to anything more than 100 to speed up movement.
movetoqt
Go straight to your quest target.
kill
Target the thing you want to kill, type this command and they'll fall over in a very dead manner. We wish the command was "Laputan Machine", though.
killall
Kills everything in the vicinity. Literally everything.
help
Lists every single console command. We've put this further down the list because we want you to actually read this article.
resurrect
Target the thing you want to bring back to life, and they'll get up in a very alive manner. You can also use this on live people to respawn them, which can fix awkward problems like Lydia taking off all her clothes for no reason.
player.modav carryweight #
Tired of getting tired? Up your carryweight and you'll be able to transport more goodies.
setpcfame #
When will I, will I be famous? When you up your fame number.
setpcinfamy #
He's not just famous, he's in-famous! Up it here.
player.setav fatigue #
Up this to stop feeling so tired all the time.
player.setav health #
Up your health here.
coc qasmoke
Bethesda's handily included a room with every single in-game item in it - type this command to go straight there. It might take a while to load - there are thousands of items here. Type " coc Riverwood " to return to the game.
qqq
Quit the game without having to go through any of those pesky menus.
removeallitems
Target a character and type this and you'll get all their items - including their clothes. Note: does not work in real life.
sexchange
Change your character's gender. Note: does not work in real life.
set timescale to #
This defaults at 16 - 1 is realtime. Up it to experience crazy timelapse-style Skyrim.
There are undoubtedly more codes to come. Skyrim may be built on Bethesda's new Creation engine, but these commands are very similar to Fallout 3 and Oblivion's. Let us know what you've found in the comments

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placeatme
Use this to spawn NPCs and monsters at your location. Just replace actor/object ID with a Base ID (not a Ref ID) from our list of Skyrim NPC codes. This is the command we used to crank out a horde of dragons around Whiterun. Note that this command spawns new creatures, rather than moving old ones, if you use it on an NPC, you'll clone them.
moveto
Use this to move yourself next to an NPC, useful for Kharjo, the nomadic Khajit, who can be hard to find as he follows the caravans around Skyrim. In this case you replace the words 'actor ID' with the Ref ID (not the Base ID), the opposite of placeatme. You can find the ID in our list of Skyrim NPC codes.
setrelationshiprank
Select two NPCs and set the relationship between them, the values range from 4 (lover) to -4 (archnemesis). Use it to make NPCs fight or do other er... more worrying things.
addtofaction
Click on an NPC and use this command to add them to a faction. It's not just about Stormcloaks and Imperials though, using 0005C84D will add a character to the follower faction, giving them the necessary dialogue to join you, while 00019809 will add them to the 'potential spouse' faction, allowing you to marry them. This won't work on NPCs with unique voices however, so you won't be able to wed Esbern or General Tullius any time soon.
disable
Also known as the 'I have no mouth and I must scream' command. Disable banishes the selected NPC to some sort of weird coding limbo. They become invisible, have no collisions and AI won't interact with them, but they're still technically there. Horrifying.
enable
Undoes the effects of the Disable command. Disabling and then Enabling your follower will reset them to your current level, which is a handy way of making sure they stay useful in a fight.
setessential
It might be fun putting on god mode and becoming immortal, but don't you get a little lonely knowing that one day all the other characters you loved will die? I know I do. Thankfully there's a solution, simply use this console command with a 1 to set characters to 'essential', which means they'll take damage until they fall on their knees, but then get up again. Using it with a 0 will turn

Here is the full site (and the extra lists)

http://www.pcgamer.com/skyrim-console-commands-let-you-cheat-and-do-other-stuff/

Cheers!