I agree with you re the phone simplicity.

I have a couple medical applications I use in my practice fairly heavily (ePocrates and Pregnancy Wheel).

For non-medical apps:
eWallet (encrypted storage of passwords, credit cards, freq flyer number, etc).
BerryWeather (GPS-found local, as well as other locations of your choice)
Pandora (music)
Noah Bible by Laridian (duh...the Bible)
Delta BB app (my Delta airlines account, upcoming trips, online checkin, etc)
Poynt (restaurants in your GPS area, etc)
Sprint Tel-Nav (GPS navigation; useful if I don't have my Garmin GPS with me)

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