I'll post some for the Android phone that I have...these are some of my favorites:

  • Swype (so much better & cooler than the built-in keyboard!)
  • Handcent SMS (I like this text messaging program better than the one that came with the phone...tons of features!)
  • Android Agenda Widget (best calendar app I've found to show all my upcoming GCal events on a screen)
  • Shazam (for that occasional song you hear on the radio that you want to know the name of)
  • Barcode Scanner (I don't really use this to look up prices of things...more so for the random android barcodes I may stumble across)
  • Astro File Manager (file manager to see all the files I have on my phone/SD card as well as play videos I've saved on there)
  • Gtasks (I have this linked to my Google Tasks, essentially as a to-do list)
  • Foursquare/Yelp (I'm addicted to checking into Foursquare and Yelp and writing reviews/posting pictures)
  • Tip Calculator is handy (especially if you have a big group bill you need to split)
  • Words with Friends (scrabble game you can play against your friends)
  • Alchemy (fun game)
  • And I use AppBrain to keep track of all the apps I have on my phone, and I can install/uninstall stuff from the web. Easier than navigating through the marketplace, IMHO.