Just a quick note, if you happen to be running a service that will call automated tests like WatiN or IEUnit that need to open a browser or interact with the desktop in some way, you need to go into Computer Management, open the properties for that service and check the box that says "Allow this service to interact with the desktop."

This is just a minor thing, but there were some assemblies I needed in the GAC and wanted to reference them with minimum hasslehoff, so I just copied them out of the C:\windows\assembly\gac folder using the command prompt.  I got the solution from this post