My favs are Pulse (news and RSS feed app); Evernote; Ted; Life (photos from the magazine, in supurb resolution); Kindle (all my kindle books transfered over immediately!); and for some mindless relaxation, a game called Blocks.
So far I really use Flipboard, a media dashboard quite a bit. I also like the content on the NPR, PBS and Turner Classic Movie (TCM) apps and am hopelessly addicted to the game Angry Birds. A few more I like are WeatherBug, Starmap (night sky program) and HootSuite (Twitter tracking program)