Got some new killer recommendations.
Angry Birds (don't think, just buy)
IMDB app
Lovefilm (only is you use it of course but it works a treat)
Tesco clubcard barcode generator (like before, only good if you use it)
Canabalt (really addictive short burst running and jumping game, much better than it sounds)
Playing GTA on it too, although it's abit fiddly.