Kindle, Free books, B&N eReader, Bloomberg, Twitterrific, Declaration, Constitution, Yahoo! Entertainment, Netflix, Flixster, IMDB, radio.com, Pandora, Weatherbug lite, Epicurious, BigOven Lite, IM+ Lite, ScoreMobile, Gilt, WeRule Gold, Whistle Those are the ones i use the most. The list is bigger if you are jailbroken.
I have Facebook, we rule, blocks, stanza, Ibook,evernote, dropbox,bible,pleco,dictionary,sundry notes.the lists is endless as everyday you check the app store.
Free apps are free. How about apps that are only free for awhile? iPad Apps, iPhone Apps, Deals and Discovery at App Shopper - Popular Recent Changes Check for price changes to find apps that are free at the moment.
Excellent tip. I also check AppShopper every day to see what apps are on sale. I've found some real gems that way.