Oh Buffy how I miss you!
Of course there are lots of shows that I miss. Unfortunately most of them outlived their welcome so their demise was more a cry of relief than a cry of anger at a particular network (Heroes I'm looking at you!). Buffy, X-Files and West Wing all went on far past their best before dates. Although I'm more inclined to forgive Buffy as the later seasons had decidedly more Spike.
Of course some cancellations make a person mad at the universe - Arrested Development anyone? That is the funniest comedy ever imo. I hope the movie gets made so we can see what happened to the Bluth's. And get some chicken dancing.