Besides web browsers, PSP already has some other nice features(homebrewed, ofcourse), like irc on PSP(which SO pwns Pictochat), and putting TiVo and ebooks on PSP too.
And just think, this is the beginning, soon they'll be many more homebrewed applications we can leech off of people that have way too much time on their hands!
That reminds me though- does anyone know how DS will connect to the net? I don't see any options anywhere on it, and it obviously can't download an update when it can't connect in the first place, so how is it supposed to work?