If like me you like to keep your consoles in a virgin state then you'll no-doubt be interest in this method of opening the clips on the back of the xbox 360 without scuffing it up!
There's pics and info here:http://www.clevermod.com/index.php?article=24
Basically, use a CD/DVD spindle/tub plastic to make an xbox 360 case opening key that presses in all the tabs at the same time.
It takes about 5 mins to make up the keys, the plastic can be cut with regular scissors. Any chunk of thin but stiff plastic will do. If you've not got a CD/DVD tub lying around then you could try using an old plastic store card or something similar.
If anyone finds this useful please let me know!