The usual google stuff (Talk, Voice, Gmail, Maps, Translate)
Twitter, Facebook, G+
Foursquare
GroupMe (Can now be used for one-on-one messages too instead of SMS.)
OneBusAway
FareBot (My app. Check the balace of your Clipper/ORCA card. Requires NFC.)
TripIt
Shazam
Chrome to Phone
ROM Manager
Catch Notes
HotelTonight (awful awful app, but I got a good last-minute hotel deal with it)
Uber
