A Library of Open Access Digital Libraries

If you're a fan of digital libraries - and, let's face it, who isn't? - you'll find this mega-list useful, especially because:

The sites listed here are mainly open access, which means that the digital formats are viewable and usable by the general public.

That's not to say it's anywhere near complete, not least because it has it's own, self-confessed biases:

This list contains over 250 libraries and archives that focus mainly on localized, regional, and U.S. history, but it also includes larger collections, eText and eBook repositories, and a short list of directories to help you continue your research efforts.

(Via DigitalKoans.)