With the kindle app you can go to your amazon.com account / manage your kindle and download content to your iPod
With Stanza Upload drm free ebooks to:
http://m.bookworm.oreilly.com/
that's the easiest method I'm aware of. I'm sure other people will give you tips
the iPod touch is a great device and I use it for most of my Internet browsing and email. I also like the Amazon mobile app and eBay mobile.