I just discovered an excellent source of information on Lightroom: The Lightroom Queen, aka Victoria Bamton, at www.lightroomqueen.com. Sign up for her blog and you'll also get a free e-book on setting up, using, and troubleshooting LR. It's well organized, clearly written, and easy to follow and use. (She takes no knowledge for granted!)
I can't recommend this source highly enough!
Yup - this is an excellent website.