Master Pages
We've played around with other items further down the list, but at least currently, they are more exotic techniques that we have yet to incorporate into the website. Master pages are a completely different story. While problematic, they are a tremendously powerful ASP.NET templating tool. A supercharged variation on a server side include, the potential of master pages caused us to bury months in the project of redoing our template as a content page for a nested master page structure for the entire family of Earth Chronicle websites. This is where we elucidate how our Master Page development eventually yielded the 2008 version of the website template. With any luck "ha ha", we won't have to change it for awhile. (Though of course, there are some fantastic uses of both databases and an XML-based Google sitemap that could rock.)