UPDATE:

Version 1.1 is out now, the Vanilla file with no other changes apart from the no borders line.

Description:
This is an .ini file to replace the original Skyrim.ini file (seen as 'Skyrim', you don't see the '.ini' part).It goes in My Documents/My Games/Skyrim. It is tweaked to remove the borders that prevent you from leaving Skyrim. Have fun! :) (if you go too far, you start falling through the ground, just use the console for this, type in 'tcl' (without the ') to enable no-clip mode.

Install note:

(default)
1. Go to My Documents
2. Then to 'My Games'
3. Then to 'Skyrim'. In that folder there should be a file called 'Skyrim'. (you can open it with notepad)
4. Make a back-up to be safe, then replace it with the file from the .rar you just downloaded.
5. DONE! :) Run the game, pick a direction and keep going. Remember that to keep going even after the ground isn't solid anymore, use the console and the 'tcl' command.

Legal:

I made this in literally 2 minutes, if that. Anyone can use it without any need of giving credit. :)

Don't forget to endorse ;)

To those who know how to tweak the .ini file, here's the command:
"bBorderRegionsEnabled=1" You need to change the 1 to a 0, then add it last under the 'General' part of the file.