Web Tennis - great site from a fellow called Brent over in California, with lots of free tips. Excellent advice on tennis elbow and other tennis related injuries. It's fine to sign up to the tips via e-mail - you get set a series of tips on a subject via e-mail, and you can sign off anytime- especially recommended is one on something you may not even be aware you're doing when you're playing - breathing.
http://www.webtennis.net
Fuzzy Yellow Balls - lots of free coaching advice and videos: all you have to do is subscribe to the site with your e-mail.
http://www.fuzzyyellowballs.com/
Virtual Tennis Academy - a
modern site with detailed analysis of how the professionals form their
shots, as well as many coaching videos on all aspects of the game.
Very good on the "new" forehand,
which they call the Millenium forehand i.e the ball is hit well our
in front of the body with maximum body rotation for power. You can check
out their goods for free: if you'd like more sign up for a month's membership:
this is good value and you'll be able to absorb enough to keep you improving
for a year.
www.virtualtennisacademy.com/
Local area information: http://www.tavistock.gov.uk/