(I used to be a big fan of used book stores. Until I tried trading off some
 books at one I had patronized for years - Magus in Seattle. They had a sign
 in the front window that said they did such trades. Wouldn't give me the 
 time of day. Couldn't even be bothered looking at what I had. Live and 
 learn. I'll never go back there again. 

 ABE is great for most anything you want. They and their vendors know and
 care about books. Amazon sux Bigtime. I was a Amazon bookseller and know 
 whereof I speak. Half.com is great if you want to sell books to the unwashed,
 no-taste masses. But nobody around there knows or cares about books beyond
 their price. An increasing number of titles are available online in HTML or 
 plain text. Pop the name in a search engine. You might be pleasantly 
 surprised.)

 ABE - used books
 Book Crossing         - books just wanna be free
 Publius Homepage - Get Published
 EServer.org - Accessible On-line Publishing
 Tons 'o On-line Books
 Lightning Source - On-Demand Book Printing
 Mesorah Publications - Jewish Books
 Glenn Larson - Book Technology

 BookSense.com