If you have an iPhone or an iPod touch, you must try ebooks. It’s just such a natural use of the form factor. Being a heavy (ie : daily) reader of ebooks, I have a couple of ebook reading software on my iPhone. Teleread has a comprehensive overview of all the current ebook reader options for the iPhone.

Chris Meadows over at Teleread reviews the following ebook software for the iPhone :
- BookShelf
- eReader
- Stanza
- iSilo
- AppEngines (bundled eBook plus Reader)

I personally use eReader (for eReader formats and Palm Doc) and the free, ad-supported version of BookShelf, called BookShelfLT (for DRM-free Mobipocket books).

As an aside, Chris Meadows (I think it’s the same person) also wrote Robotech fanfiction which I read while I was in college — that was my introduction to the world of e-text.