This comes straight from the cheat engine forums, credit goes to "Csimbi", I will keep the table as up to date as possible.
Works to same as the old versions, but for those that dont know do as follows;
WORKING (29/09/2012)
Golden Keys:
1. Open the file below, change the extension from .txt to .CT
2. Select Borderlands 2 as your process, make sure the game is open....
3. Keep current table
4. Start/continue game you wish to cheat on.
5. Go back to cheat engine once your in and scroll down to find the golden key bit (at the very bottom).
6. Set "Key Available"'s value to 250.
7. Set Keys used to 0 and click on the active box once (to freeze the amount of keys.)
For the other stuff:
1. Do up to step 4 from the previous instructions
2. Once in game go back to table and click active on what you want to used, if a sub table is dropped down select also from there.
VIDEO GUIDE:
I did not make this im just spreading the fun.
A little tip for checking if it out of date for your game, if once your in game and when you have selected the process and you 100% sure you've followed the step, go to the golden keys and if it does NOT display a value and instead is "??" its out of date.
Updated for game ver. 1.03 (will update version for current table, so you can kinda keep track.)
Scan 1 and 2