Here is an interesting add on: http://sdctasks.codeplex.com/ It has many tasks and targets.

I found the "sdctasks" from this site: http://tfsbuild.com/MainPage.ashx

http://blogs.msdn.com/msbuild/archive/2007/04/26/building-projects-in-pa... shows how to build using multiple cores. Also, shows some ability to keep projects from building at the same time.

Finally, http://wix.sourceforge.net/votive.html seems to offer Wix ability as well.