I have the Storm (yeah, it's pretty much a book weight, I know.)
I don't have ten Apps. I don't have enough internal memory for them :(
But, my top few are:
Google Maps (I love it, haha.)
I tried downloading bolt browser, it's nice, but it's not really touch-screen friendly. I think i'm going to try the opera one later.
I've tried the tumblr app and bbm as well. But I don't really use tumblr, and I don't know enough people with a BB to merit leaving BBM installed lol.