Yale books in Microsoft Live

According to a Yale Library press release, Yale and Microsoft will be adding over 100,000 English language, out-of-copyright books to Microsoft's Live Search (http://books.live.com/). There are already a good selection of Yale's books in Microsoft's digital book collection, which has gotten a lot less press than Google's digitization projects. While some of the results in a Live search for Yale are behind password walls, the open ones are easily identified by a "100% viewable" note. There's also a little dropdown box to filter your results to just the "100% viewable" ones.

Other digitization projects:
Google Books
Open Content Alliance
Internet Archive's Texts
Project Gutenberg
...more digitized book collections