Wow.. you should really expand your horizons! How long have you owned an iPhone?
Personally I have about 65 applications (including stock), and use 20-25 on a regular basis.
13 besides stock apps: ColorSplash, Facebook, GlowColoring, iVideoCamera, Last.fm, Let's golf!, Meebo, PS Mobile, SoundHound, Tweetie, waze, Younicorn, Zombie Me.