I need more apps.
I really enjoy the apps Path (a beautiful photo sharing app for you and your close friends) iBooks, Shazam, eBuddy, Photoshop Express, and Viper (free iPhone to iPhone calling over the web!). Those are some free apps I love but there are more.
Bubble Shooter, Skype, Facebook, Twitter
I dig Instagram and Appsfire. Intonow looks pretty interesting as well.