IndieBound is a new free app available for the iPhone that lists the latest indie booksellers recommendations and best sellers by category. You can browse recommendation lists, search for books, search for bookstores in your area. It’s a pretty great program. I’m hoping the next release will include the ability to “favorite” or “wish list” a book. There’s no way to make note of which books you want to purchase unless you *gasp* use pen & paper. 
Here’s a couple of screenshots I took with on my iPhone. (Also, the store finder, found all three indie bookstores in my area!)
http://itunes.apple.com/WebObjects/MZStore.woa/wa/viewSoftware?id=310898838&mt=8
