Angry Birds have a separate HD ($4.99) and iPhone/iPod versions. I refused to pay the $4.99 and have Angry Birds Seasons HD instead ($1.99).
Air Video (Streams from the media Mac Mini in the living room)
Zinio (magazines)
Wired, Vanity Fair
Numbers, Keynote, Pages (Apple's iWork for iPad)
Friendly (Facebook)
1Password
DropBox
Remove (Control iTunes from the iPad)
PhotoPad
OnTheFly (ITA Software), Kayak HD
Angry Birds Seasons HD
Cut The Rope HD
BBC News, HS (finnish newspaper), NZ Herald
Terra (Alternative browser, Apple's Safari on the iPad isn't that great, especially the reloading of tabs is really annoying)
Plus a number of Apps in the folders but they don't get used that much. Some of the above (Terra and Friendly) have found their way to the dock.
OffMaps has worked quite fine for my navigation needs. I usually don't need directions, I just want to know where we are and I can figure out the route myself. And I need navigation mainly abroad, thus pre-loaded maps.