I have accidentally stumbled upon a rich source of photographic resource online, and more about how I got there in a later post. While previewing a book online, I noticed a list of related content being displayed on the side and followed one. I arrived at a Web site called issuu.com (read it as issue, leave it to the Internet!) I started looking around, did a few quick searches and found that there are a large number of photographic books, magazines, portfolios, etc. at least for viewing online and many being available to download. Let me give you a few quick links, but also suggest that you type in your search phrase, photographer or author name, subject, and find out what else is available. Fair warning though, it may become a time sink!
Photoshop CS5 Pocket Guide
and the list goes on. You will be surprised at the variety of subjects and the quality of available resources. Give it a try. Share your finds and comments here with others if you like.