We have just released the SQLServer 2008 developer Training kit. This kit will help you understand how to build web applications which deeply exploit the rich data types, programming models and new development paradigms in SQL Server 2008. Roger has been pretty busy packaging this up into something that you will find is easy to install on your machine and gets you started. This kit is full supported with SQLServer Express version which you can download here.
You can find more details at the following location