Shazam (what song is that?)
Facebook
FriendSync (syncs FB profile photos to your Contacts)
Echofon (for Twitter)
IM+
Yelp
Mobile Fotos (if you use Flickr)
AP Mobile (news aggregator)
Wikipanion
Stanza (ebook reader)
Now Playing
iCam (uses your laptop camera or other web cam)
PhoneFlicks (if you use Netflix)
iTap (turns iPhone into remote touchpad for your computer)
RedLaser (barcode reader/price-finder)
Kayak (kayak.com)
Ambiance
BigOven (if you like to cook)
SlingPlayer (if you have a SlingBox)
Photogene (mini-Photoshop for iPhone)
Convertbot