Introducing Microsoft SQL Server 2008 from Microsoft Press is available as a FREE download. By Peter DeBetta, Greg Low, and Mark Whitehorn. ISBN: 9780735625587
How to get it: Register at http://csna01.libredigital.com/?urss1q2we6
NOTE: Once you’ve authenticated using your Passport/Live ID the only required fields for registration are: name, country, role, and an email address. You’re taken directly to the download from there (you will need to temporarily allow Pop-Ups for the download window).