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Bob McGuigan: How many variations are in his books Whole Board Thinking in Joseki? What's in those books would be a start, at least.
Thad: While I think it is a good idea to read the books, I believe the isea is backwards. While Mr. Yang may not say so, knowledge of the 300 is important for the book. The idea of the book is to teach how to judge which of the 300 to choose in a given situation.
Also the books only deal with joseki beginning with a 3-4 stone. Others were planned but never written.
Bob McGuigan: The original question was what are the 300 important joseki, and I was suggesting that looking at what Mr. Yang put in the books would give a start on getting that information. Actually I think these books are a good way to learn the basic joseki, too. What you really want to do is learn the reasons for the moves, not just the sequences. Yang's book can be used as a quiz. You take a starting position, think about it, and choose one of the options offered. Then you can read the answer/commentary to see whether your thinking was correct or what misconceptions you had. You don't need to know the joseki ahead of time.