I just noticed that Sayed Hashimi's article about MSBuild and the WiX toolset in the March 2007 issue of MSDN Magazine. I reviewed the document a couple months ago. It skims over the WiX toolset pretty quickly but that's okay because the real focus is on MSBuild integration. Most importantly, I fully support the opening statement:
During the course of development, it's important to have an automated build process. Equally important is having an automated means of creating releases. Unfortunately, in many organizations-especially smaller ones-this doesn't happen. Typically, you'll find that the release is simply cobbled together at the last minute. However, if you take the time to set up an automated build and release plan, you'll save countless hours that could be better spent on tasks other than building and releasing your project.
That's basically a paragraph summary of my old MSDN Article. Anyway, both articles are good quick reads. It's also nice to see the WiX toolset getting a bit more exposure.