Apress has a new program called Alpha where they make available books in progress. You can download, for a price, an e-copy of some of the chapters of the book for early review. It allows you to get in on the action a bit and you can post comments to the author to influence the final work. My new book, SQL Server 2008 Query Performance Tuning Distilled, just got added to the Alpha program. They have 10 of the 16 chapters posted. Additionally, they've got a publication date set for March. I've only seen the production copy of three of the chapters and I'm on the second draft of chapter 16, so I think that seems tight, but they're the pros.