To a previous poster:
I thought Clerks: The Animated Series was only 6 episodes, not 8. I have the DVD and there are only 6 episodes on mine. If there are 8, I was jipped man.
Anyways:
Boomtown-One of the best shows I've seen in a while. There was supposed to be a full series DVD, but Season One was only released on DVD.
Freaks and Geeks-Way too ahead of its time. I thought Undeclared could have been its second season.
Roswell-I find this show to almost be a guilty pleasure, but it was great nontheless.
Heroes-I loved the show ever since the first season. I thought Season 4 was good, but not their best work, and the series finale could have brought new storylines and different angles to light.
Kyle XY-My favorite show to get cancelled way before its time. Even though it was on ABC Family, I really liked this show and everything about it. I also liked the super hot actress that played Jessie XX, Jaimie Alexander.
Shows I liked and was almost thankful that the series were cancelled because the seasons were getting dull:
24, The Shield, That 70's Show, Prison Break, The Unit, and My Name Is Earl.