Today on the www.asp.net site we posted a great new "How Do I?" video series focused on SQL Server 2005 Express (which you can download and use completely for free).
The series features 13 professional videos that start at the very beginning and then explore designing tables/schemas, using data types, creating SPROCs, using reporting services and the business intelligence engine, enabling full text search across your data, and more (I'm guessing even most devs with a lot of data experience might learn some new things from the reporting services and full text search videos):
You can download or watch the the SQL Training videos online for free here.
In case you missed my posts on uploading a SQL Express or SQL Server Database into a remote hosting environment, I also highly recommend going back and reading these two posts:
Earlier this summer I also posted a popular blog post topic that provides 100s of sample database schemas you can download and use within your applications:
And finally (and perhaps most importantly), make sure to check out Scott Mitchell's awesome ASP.NET Data Tutorials here (there are more than 50 fantastic tutorials all in VB and C# for common data scenarios in ASP.NET):
Hope this helps,
Scott