Mine are:
My So-Called Life
Freaks & Geeks
Firefly
Nickelodeon Doug (the Disney version was horrible)
Salute Your Shorts
Are You Afraid of the Dark? (they got real bad towards the end, but it could easily make a comeback with a new cast and new stories)
Also, I MEGA miss Breaking Bad (my fave show of all time), Dexter and S** & the City (not sure if I can say that word on this forum, lol O_o)...but they all ended when they should have. Dexter should have ended WELL before it had, haha. I haven't even wanted to purchase the last three seasons. 1-5 were terrific in their own way.