If you go into any bookstore, you’ll find an overwhelming selection of photography books. These are the ones that I own and love, and reread on a regular basis.
BorrowLenses is a fabulous place to rent camera gear. They have a great selection of equipment, and my dealings with them have been excellent. If you’re in the San Francisco bay area, they have a few different places where you can pick up and drop off your rental equipment.
Strobist is an excellent resource for learning about off-camera lighting and lighting techniques.
Flickr is the site that I use for hosting and sharing images. A basic account is free, and a fully-featured one is only a few dollars a year. Image hosting at Flickr is pretty simple.
LensRentals is an excellent resource for renting lenses in order to try them out, or when you just need a special lens for a little while. I’ve had excellent service from them.
dpreview does excellent in-depth reviews of digital cameras. Their side-by-side comparison tool is great if you want to look at the differences between different cameras.