Ringdroid- make a ringer of any part or length of a song, also useful for changing your notification sounds.
Shazam- ever wondered what that song was? Hold your Moment up to the radio and it identifies the song/album
TuneWiki- MP3 player with lyrics
Google Voice- free calls using my google voice account
Anobiit- portable library of your books, just scan them in
Barcode Scanner- used with several apps
ShopSavy- are you paying too much?
Snaptell- for when you don't have a barcode
Layar- will blow your mind with the info that's out there, VR anyone?
Google Sky- and this one will make you feel small
Pkt Auctions Ebay-
Tricorder- yes an actual fully functional tricorder, it really works!