My favourite apps:
Amazon Kindle - Kindle for Android
BBC News - gives headlines and stories for different topics which you can specify from the list
ESPN Goals - shows you English Premier League goals from the days games
Netflix - handy if you have a Netflix account
Ulysees Speedometer - gives a GPS speedo, and HUD display function of speed when in the car
ConvertPad - gives you conversion data on weights, distance, time etc
Swiftkey X - keyboard which I think is much better thean the Android OS keyboard
Endomondo Pro - Fitness tracker App. TRacks by GPS, gives google map route of your workout, lap/split times, allows intervals, beat your time etc
Games:
Many that have been mentioned, plus
Angy Birds Space - only hold my interest for about 10 minutes at a time if honest
Drop 7 - number based, sort of Tetris style) game
Turbofly 3D - Wipeout style racer
Whack your boss - find ways to kill your annoying boss using office equipment
Robot Unicorn Attack - sidescrolling platform type thing