Which are the best books, websites to learn Photoshop?

Here are a few sites that I used and still use to improve in Adobe Photoshop. 1. http://psd.tutsplus.com/ -This one has a great collection of really unique tutorials. A lot of sites link this site for tutorials. 2. http://www.tutorial9.net/ -They have great links to good tutorials.If you're interested also in photography and Illustrator, they also have tutorials for it. 3. http://abduzeedo.com/tutorials?page=1 -This one's a page by a graphic artist. He's really good at glowing texts and stuff, he's kind enough to share all of these in his website.