I'm glad to see Aaron Stebner started blogging about setup (installer).
Before Aaron switched team, he was a QA lead in the VS / .NET setup team, which I'm working for. He was a great resource then. Looks like his posts will be a new valuable source of information for my work. I expect them to be useful to anyone interested in setup technologies as well.
In particular, he recommended this article on MSI component rules written by Rob Mensching. It's 11pm and I need to rest now, but the first thing on Monday I'm gonna read it and save it in OneNote for future reference.