Microsoft Learning is offering a free, three-hour, self-paced, web-based, on-line training course on the improvements that will be available with SQL Server 2008. The course is text-based, so you will be spending a lot of time reading, but it it worth it if you want to get a head start on SQL Server 2008.
The course is called "Clinic 6188: What's New in Microsoft SQL Server 2008 for Enterprise Data Platform," and is divided into three catetgories, so you can focus on what most interests you.
What's New in SQL Server 2008 for Enterprise Data Platform
What's New in SQL Server 2008 for Business Intelligence
What's New in SQL Server 2008 for Database Development
https://www.microsoftelearning.com/eLearning/offerDetail.aspx?offerPriceId=139087
You need a Microsoft Live Account to register for this free course.