While Stanza saves e-books to your iPod/iPhone, the free version of Read It Later saves web articles so you can view them offline. You do need an account if you want to view your saved articles on the web, and use the bookmarklet for your mobile Safari browser while online, that will help you save a webpage.
If you use Read It Later’s Firefox addon (which enables you to save webpages from your desktop browser), just open the app when you’re online so it will sync the saved webpages and you’ll be able to view those articles on your iPod later in offline mode.
