The Stanza app is "all that and a bag of chips" as far as I'm concerned. I really like it. If they did a port to the iPad "as is" - I'd read with it on the iPad even without the pretty "page turning" graphics of the iPad.
Knowing that Amazon owns Stanza -- and has even improved Stanza -- but has NOT improved their own kindle app -- is frustrating. Amazon lost sales to Fictionwise from me because I adore Stanza and really do not like the Kindle app. It's not enough for them to have an app on every device -- it needs to be a GREAT app on every device.