American Gothic Freaks & Geeks Andy Richter Controls The Universe (I never watched when it was on, but they show reruns sometimes on HDNet and it never fails to make me laugh out loud)
If I had a time machine, My So-Called Life, but I wouldn't want it restarted now.
I would have said "The Job", but now we have Leary in the excellent "Rescue Me". Or "Haunted", but now Matthew Fox has gone on to "Lost". Or "Keen Eddie", but Mark Valley at least has "Boston Legal".
So. . .
EZ Streets (Pantoliano now has "Dr. Vegas". . .but I'd cancel it in a minute to get him back on "EZ Streets". ) Touching Evil Boomtown
John Doe (Everytime a thread like this comes up, I always have to once again announce how much I miss this show, and how I hate FOX!)
Hope Island (Here's another one I always mention. I know, I know, I'm sure nobody here has ever heard of it because it was on PAX, but it was a super great and quirky show! Hard to believe it's been *almost* 5 years...)
I have so many shows that have gotten cancelled out from under me, it's hard to pick a third. Although, most of them did have good long runs, I mean nothing can last forever. "John Doe" and "Hope Island" are the ones that always come running into my mind whenever I think about cancelled shows, though. For my third show, I guess I'd have to say The Guardian or maybe Beyond Belief: Fact or Fiction. Beyond Belief was so different, kind of like a game show, but it really wasn't. It was fun to try and guess which stories were fact and which ones were fiction!
An underrated show that's Showtime aired again recently (with the 6 episodes never shown in the US). Very X-Filesy, almost to a fault. It had a good premise, though, and I really liked it.
2. Family Guy
Never should have been cancelled in the first place, thank the powers that be that it's coming back.