Fancy some PS3 file sharing?

I've found an interesting link on a gaming website that helps friends with PS3's share their games, saving on cost and meaning you can both play the same games. Here it is:

http://sarcasticgamer.com/forums/showthread.php?t=5664&highlight=file+sharing

There are some restrictions, but most downloadable games look as though they can be shared, particularly add-ons.