There is an international list of more than 5000 restorers in various disciplines. More than 200 training opportunities for restorers are listed. The newer is the official site of the Association of Restorers , which now claims 400 members and is having a convention in June. This site also has articles about restoration, written by a number of specialists. Often they are reprinted from publications.
Discussion groups are available, and lists of members are maintained.
Books and training videos are advertised. If you are a restorer, or if you do restoration as part of your antiques collecting or dealing, these two sites are worth visiting. It is a tiny topic, but Olquin Woodworking maintains a large Web site dealing with shellac. Here you can find lengthy articles on mixing and using shellac. There is a major treatise on experiments to rediscover French polishing techniques.