My Favs

1. MotionX GPS Drive- Voice guided GPS not free but pay as you use, I think $2 per month, whenever you need it. No voice GPS is free

2.Dropbox (free)-Save your documents and files in your computer and access from your phone.

3. Personal Assistant (Free)-View all your accounts in a single window (credit cards, banks, Utilities, Gas, etc)

4.Google Reference (Free)-Great voice search app.

5. Bump (free)-Can be handy when sharing files and contacts with another iphone user.

Would love to hear what others are using.