I've recently downloaded the Marvel App. Best app ever!
It is very cool. But for myself I can't wait to start editing my scanned comics into a book format (probably start next week when I have a bit more free time), currently just reading them as images (which is till works great as you can still easily expand the page (or even just a panel), and unlike a laptop (or desktop) its orientation can display the book in a proper manner.
If you are a comic fan, as far as major players there is nothing out there that beats the ipad as a comic reader.
For just that, it was worth my money.