This book mentions every sparkling wine you've ever heard of and many more that you haven't. I own several other good champagne books, but if I could only choose one, this would be it. My favorite feature: Stevenson mentions the best wines for each vintage -- something no other book I've found does. Highly recommended.
The only book I have found that covers California sparkling wines in depth and provides comparative notes to French Champagnes. Has a lot of weird stuff in it like sparking wine made in India and Kenya. Stevenson is quite witty and acerbic in some of his comments and pulls no punches.