Links to informative tennis sites

I stumbled upon a post at Google Answers that many of you may find useful, because it includes research to unearth links to many great tennis websites. Here's the question:

I'm interested in obtaining a list of the best tennis resources currently online. I want to improve my game (I'm a novice) so I'm very interested in training, strategy, and tactics. I don't want links to sites that discuss statistics or scores or specific players without providing key strategic game-playing information . . . .

See what the Google researcher came up with for an answer.