Just a quick public service announcement: if you use Stanza to read ebooks, you should know that since its purchase by Amazon, the app is no longer supported *and does not work under iOS 5.*
If you upgrade your iOS tomorrow, Stanza will not work. If you have ebooks only on you iOS device you should use the Share button to send them to yourself, then load them in a new ebook reader.
As for new iOS 5 compatible ebook readers, I’m currently test-driving Bluefire. I like it so far, but don’t consider this a strong recommendation as I haven’t used it extensively yet. I’d be open to any other suggestions.
Also: RIP Stanza, and thank you to Lexcycle for the hard work they put into the app.