I've been toying with the notes function on my iPod. So far, it's been limited to helpful reference information. Being a Unix guy, I find the ability to keep specific command-line administration tips and other information on my iPod pretty handy.
Of course there is always somebody who gets it just a little more than I do. Reading e-books on the iPod makes perfect sense and is completely obvious once you think about it. I've linked a few resources below to get you started:
(Get the Rich Text download and convert it to plain text)
Have a good online e-book resource? Share it with a comment below.