My favorites:
- AppBox Pro (already described)
- Viewti Golf (3D course layouts, tracks scores, pick target based on analysis of your game, GPS, etc.)
- Wikipanion (self explanatory)
- News Feed (tons of new sources)
- Pandora (already described)
- Sudoku (self explanatory)
CardStar is wonderful in theory but doesn't work well. You enter your merchant "loyaty card" numbers and it duplicates your card's bar code. Theoretically, you can scan the duplicated bar code in CardStar rather than carrying all of your merchant loyatly cards. However, it usually doesn't work.
Redlaser is also good in theory, but doesn't work well. Theortically, you scan the bar code of an item you see at a store, and it will tell you the sales price of that same item at other stores, including online.