There are over 100,000 apps for the iPhone now...way too many for most people to have played with.

Most apps are fufu type of game apps, or idle time wasters. There are some nice apps, like Podcasting, media, communication type of apps. Some of the most popular are Facebook, twitter, etc types of app.

I find I use Shazam somewhat regularly to figure out what that song is on the radio. Second to that is using Safari to browse the web on it.

Having a mobile web is incredible. Just having access to all the vast info on the internet alone is a killer app.