8,000 degrees of John Munch?

Does anyone know of a site that has a good master list of all the TV shows that are in the same fictional universe because of the many guest appearances of Det. Munch from "Homicide"? (i.e., Munch was on "X-Files," which then links "Homicide" with "The Simpsons" because Mulder and Scully once went to Springfield.) I know a lot of them off the top of my head, sadly, but I'm looking for a site that lays out the whole "it's all in Tommy Westphall's imagination" issue in clear, easy-to-follow language.