This fella Michael J. Coffey has compiled info on various aspects of tea into a wiki. Worth checking out if you're into the stuff. He also has a blog.
Another recommended site on the subject is the Tea Masters Blog, ran by Stéphane Erler. He writes in english as well as in french; if you don't speak french, use a translator (e.g. Google Translate) and you'll be able to understand most of the articles.
