Here are mine.
The ones already mentioned:
-Duckman
-The Tick (I hear the live-action show didn't suck nearly as hard as I thought it did, but I've never seen it)
-Power Rangers
-Brimstone (I'm totally with you on the shittiness of that cancellation)
-MST3K
-Pokemon
-Bill Nye the Science Guy
-Square One
-Young Indiana Jones
-Start Trek the Next Generation (my vote as the greatest Start Trek show ever, I remember the last episode, and talking about it on the bus the day after)
-Dinosaurs
Unmentioned (as far as I can tell):
-The Critic (come on guys, what's wrong with you?)
-Highlander (theme song by Queen, and Adrian Paul being a badass...Scottsman?)
-Due South (just the first couple of seasons, it got really stupid when they replaced the detective)
-Stargate SG-1 (yeah, it still runs, but it started during the 90's)
-The Simpsons (obvious, but it bears mentioning because the 90's was back when it was good)
Probably tons more, but it's late and I'm tired.