There’s a few, and probably more comming. GT5P takes anywhere from 2gb to 5gb, gta4 takes like 4gb. Of course any games you download. Demos are around 500mb-1gb, but some are much smaller like the arcade style demos. Home is going to be around 1gb.
I have the 60gb, and I have about 30 demos (quite a few of them 500mb+), 10 psp demos, home, grand tourismo save (3gb), about a dozen cd’s in the best mp3 format. And a handful of 50-100mb videos from youtube and whatnot. I"m at about 25/55gb free.