As has been rumored for months, Amazon.com has released an iPhone version of its Kindle e-book thingy into the wild.
I downloaded the Kindle app this morning but haven't really gotten to test drive it since you can't buy books directly from the application and navigating the Kindle store on my iPhone is kind of a pain in the ass.
Amazon's iPhone app seems like it might cannibalize their Kindle business, since you'll no longer have to buy a $400 tablet to read e-books now. But I'm pretty sure squinting all the way through War and Peace on your phone will make you go blind, so there's that.
I'll update when I foolishly drop $10 on an e-book.