Wow lets see, every show I really seem to like gets canceled and bearly makes it 1 season
Such as..
John Doe (Loved that show, took me forever to get that on DVD, go ebay!

)
Thieves (God that one only lasted like what, 7 episodes)
Fast Lane (Ok this one was a bit cheesey though fun, but every episode was like a mini action movie)
Action (crappy but funny, cant believe they just killed off jay mohr, but I guess thats a good way to end a canceled show, kill off the main character lol)
Arrested Development (This is the latest of my ones that got canceled, at least it went two point some odd seasons worth)
Currently my still running favorites would have to be...
Smallville
Stargate SG-1 (Though they got rid of the main guy this season so well that sucks)
Prison Break (Hey the guy from John doe is in this one, but damn, no more episodes till March!

)
Coupling (BBC one, not the crudy American rip off one that aired years back)(Haven't seen this air in the US lately, is this still even on here?)
Curb Your Enthusiasm(Gotta love larry david)
Entourage ( I don't know why I like this show, I just do. )(Let's hug it out b$!#@

)