If there is one book about WebTV you should get, it's this one:
WebTV for Dummies Quick Reference by RENEE GENTRY.
Renee used to work for WebTV Networks Inc. as a product
manager. She knows just about EVERYTHING about WebTV.
I met Renee at the NAB 2000 tradeshow in Las Vegas and she
is a wonderful person. And her intelligence and knowledge
comes out in her book. This is one WebTV book that you
will want to get. -ruel