I've been excited about Silverlight since I first heard about it over a year ago. Because I started looking at it as an alpha technology, there weren't even the books out yet. So, I used the quickstarts, Bill Reiss's game tutorials, Jesse Liberty's tutorials, and other people's blogs. Well, the books finally started coming out, and I got a copy of Chad Campbell and John Stockton's Silverlight in Action.
I liked it. While I got a lot of the background from the online Silverlight resources, the book was just thorough, filled in gaps, and had really good chapters on transforms, animation, and resources (they finally just "clicked" for me).
It reminded me of the "good old days" when learning a brand new technology, and you just huddled down with a book and a computer, and hour-by-hour you kept learning something new. I think this book does a really good job of introducing developers to Silverlight.