As of Day 4, the list of the top 10 selling books at Tech Ed 2009 are:

1. Windows Server 2008 Hyper-V
2. Professional ASP.NET MVC 1
3. Mastering System Center Configuration Manager
4. Windows Server 2008 Hyper-V Unleashed
5. Professional Silverlight 2 with ASP.NET
6. Windows PowerShell Unleashed
7. Silverlight 2 in Action
8. Inside MS SQL Server 2008 T-SQL Querying
9. Programming Entity Framework
10. Microsoft Visual Studio Tips