Yes, iPhone apps, for the most part, work on iTouch. Unless they need GPS or the camera to work.
I can't live w/out the
IMDB app. No more "where did I see that actor before???" while watching tv.
NY Times app is like having the actual newspaper.
Love the
RunKeeperPro app - tracks and maps my runs with GPS, tells me every time I've gone another half mile and what my pace is, and plays whatever music or podcast I choose in the background.
I wouldn't be a runner without the
C25K app (couch to 5K). Worked sooo well.
The
flashlight app has come in handy an amazing number of times.
DD and DH are addicted to the game
PocketGod - it's kind of stupid but apparently fun.
Visual Note lets you take pictures and make notes in categories. I use it for planning clothes shopping trips, for keeping track of things I see while out that give me ideas I want to remember later, etc.
BalancePro works like a ledger sheet - I use it to "virtual envelope" all my cash every month and never go overbudget anymore.
CrunchFu is so cool. You hold the iPhone on your chest and it counts your crunches, then graphs them and creates a workout program for you to follow. We also use
PushUpFu, with an armband.
In addition to the kindle app, the regular
Amazon app rocks. It has an "Amazon remembers" feature that allows you to snap a picture of anything you're thinking about buying. Amazon then searches for the same item in their warehouse and sends you an email when they've found it (usually within an hour.) With this feature alone, I've saved enough money over the past year to pay for the iPhone's purchase.
I'm sure I'll think of more. Enjoy your "new" iPhone!