The latest version of Team Deploy (0.7.0.2) now contains the Device Controller Task.  This task allows your Team Foundation Server builds to call the x10 Firecracker to control lamps.  http://www.x10.com/automation/firecracker.htm

 See the Team Deploy website on CodePlex for all of the details and files.
http://www.codeplex.com/TeamDeploy

Here's the street light we are using for our builds.

Build Smart Not Hard

Mike