Yep, All of them. 1/4 of them are useful to me for socializing. 1/4 is useful for me for my school. 1/4 of them is useful for me in my art projects. 1/4 of them are time wasters (aka games).
Oh, all those browsers are because I code websites. It's useful to test them on all kinds. The Adobe Suite I primarily use for work and drawing. Still haven't used Flash CS5...may get rid of that. The next group is iWork....guess what's that for. Then my eBook reader for class...some app stores, note apps, games, music, and my photos. Yep...like I said, all of them.