I love me some Muppets and recently found a new few sites dedicated to their goodness.  A good starting point would the Muppet Archive which has a Muppography of all the known occurrences of Muppets. Much of this information was compiled by Bill Sherman, some of which actually originated in the book "Of Muppets & Men: The Making of the Muppet Show." The site also gets into Fraggle Rock and Dinosaurs series, watch Fraggle Rock religiously but the Dinosaurs didn't do it for me. If you're looking for another place to get your Muppet on try  the Muppetcentral forum. I could spend all day on these sites but for now I'll bask in the thought of watching Dark Crystal when I get home.