If you do a general Web search for the phrase "tennis elbow," you'll get thousands of hits. I haven't sifted through thousands of sites for you, but I have looked at enough to be able offer you this brief guide to some of the better information.
The first thing you probably want to know is whether you actually have tennis elbow or some other condition.
My article, Tennis Elbow, offers a concise definition and distinguishes between tennis elbow and golfer's elbow and links to articles about equipment and strokes that may help you prevent tennis elbow.
The clearest diagram showing the locus of tennis elbow pain is at What Is Tennis Elbow?. This article offers three diagrams in a chart comparing tennis elbow, golfer's elbow, and bursitis, but the better diagram of tennis elbow itself is the black-and-white below the chart.
Once you decide you probably have tennis elbow, you'll want to know what caused it. Before you decide to give up tennis or completely rebuild all of your strokes, you should take a look at The Canadian Centre for Occupational Health and Safety which emphasizes, as one might expect, the workplace causes of tennis elbow. It also makes some valuable points on diagnosis, treatment, and prevention.
