Devoted to spin offs of shows and crossovers between shows. When shows crossover or spin off other shows the implication is that those shows share a reality. If The Jeffersons and Archie Bunker can meet each other they clearly are part of the same world as opposed to Archie Bunker being able to turn on his TV and watch The Jeffersons. Now when you figure in that many shows do LOTS of crossovers with various shows that can lead to tons of shows all theoretically being part of the same reality.
This is where I go to get the latest news on which shows have been canned, renewed or just had a deal signed. It's a great site, and one I think you should check out. It's updated weekdays during the regular TV season, and 3 times in the summer.