Alarm Clock Free: I don't know what it does yet, but it looks like a nice clock interface.
AOL Radio: So we can go beyond our music collection and listen to other stuff.
Around Me: Mainly so we can find near by eats.
Balance: We're going on a trip; this will help tally up the cost.
Catholic Calendar: Because it's Catholic. And it's free.
Catholic Lite: A little too lite; candidate for deletion.
The Catholic Directory: So I can find near by parishes, their phone numbers and mass times. Also has the mass readings.
Dictionary: of course
DigiDrummer Lite: just for fun
Drum Meister Lite: more fun
eReader: in case we get a hankerin' to reading a book
ESPN ScoreCenter: for those rare moments when we actually want to know the score
Falling Balls: mindless fun activity; candidate for deletion
Google Mobile: find info fast
iTV: 'cause we don't have a TV Guide
iDict: In case we have to communicate in another language.
iHandy Level: just handy
Note Me: 'cause folks have said it's good
Quick Graph: Never had a graphing calculator. Neat to see stuff graphed in 3D.
Shazam: to ID music we hear and like
Space Shooter: mindless entertainment
Soduko: of course
uDrummer Lite: fun
USA Today: another source of news
Virtuoso Piano: fun. This one lets you do glissandos. It will span the whole keyboard, but difficult to do so smoothly. It's the same graphic, but the pitch changes.
The Weather Channel: weather, of course. This is in addition to the weather app that comes with the iPhone already. This one might get replaced ... still to be determined.
Yelp: mostly so we can find near by eateries
Feb 2011 update: (too many to discuss them)