For what it's worth:
My top 5 aps :
- iBody - keeps track of my blood pressure, very useful!
- Notes - I've tried many different word processing aps, but I keep coming back to Notes
- Maps - beats out my car navigation system half the time!
- iBlueSky - I do lots of cluster diagrams as a tool to assist brain storming - this is a useful ap
- Clock - still the best alarm I've found
My top 5 entertainment aps :
- Aki Mahjong - I'm addicted, and it's kept my interest over six months
- Cross Light - crossword puzzles, again, for when I'm in the mood
- Bloom - this is not a game, but a creative music ap, a superb relaxer
- Galactica - again, not a game, but a visual relaxer - I get drawn back to it
- 3D Coaster Rush - I sense I'm going to get tired of this one, but I like it best of the games that use the accelerometer that I've tried (these include many good games, but they tire quickly ... SolarQuest, Star Trek, MotoChaser, etc.)
Regarding iPod, I've discovered AudioBooks and am listening to them a lot now - both in the car while driving and at home as a means of relaxation.