Another Saturday working, oh well!
Whilst I'm busy installing the Visual Studio 2005 RTM bits, I thought I'd share a helpful hint that can save a bit of time in your TFS setup and improve overall TFS performance if you have more than a single disk in your system.
Immediately after installing SQL Server 2005 with all the recommended options, open your Microsoft SQL Server Management Studio [I do hope you installed the client tools ;)] - connect to your newly created SQL Server 2005 default instance, and in the Object Explorer right click on the SQL Server name > Properties.
Select the Database Settings panel, and update the Database default locations. In my case, I have a D: and an E: drive on which I put my logs and data files respectively.
Example:
Data: E:\MSSQL\data
Logs: D:\MSSQL\logs
For these settings to take effect, you need to restart your instance of SQL Server (right click on the SQL Server name > Restart).