Are you looking for new useful applications for your iPhone? Firstand20.com might be the answer. It is a website of iPhone homescreens from tech dignitaries, complete with explanations of why and how they use those applications - in all, it makes for a good read. The tagline on the website says it all:
— "A Collection of iPhone Home Screens — from some very talented designers, developers and tech writers"
Good stuff, you can see what tools others are using...
FYI.. along the same lines.. below is my homescreen: