if you have a laptop and want to tether it to your phone, pdanet works well.
Angry Birds helps pass the time while your passing... nevermind.
Be sure to get your authenticator loaded.
Ventriloid lets you ease drop on unsuspecting venters
parkmobile allows you to not worry about change at the meter, when parking in large cities
pandora you can listen to music
If you want to lose weight, and you run / bike, iMapMyRide is cool
GasBuddy to get cheaper gas
Android VNC to be able to log into your system from your phone
Wow does not support this method of gameplay.
Lots more, what are you trying to do? Goals for your phone? Categorically speaking?