There's also the Internet Public Library at http://ipl.lub.lu.se/ - thousands of books, and other stuff, such as magazines.

I'd put it in a clickable form here, but I haven't worked out how to do that yet. But it's well worth the effort of copying it into the address bar and paying it a visit.

www.bigfoot.com/~kevin.mcgrath ( - that's the URL for my site, not a digital book repositary)