I was just doing some digging for a colleague to find information on Wix and installing separate features by default or within a typical or custom install. This article does a comprehensive job of covering the topic. So for my own future reference and rather than rehash it, I will just post it here. (http://blogs.technet.com/b/alexshev/archive/2008/08/23/from-msi-to-wix-part-4-features-and-components.aspx). Note: I haven't actually tried the sample code yet.
