Science on TV

http://expertvoices.nsdl.org/tvscience/

http://pbskids.org/dragonflytv/scifair/index.html

Mr. Wizard
http://www.mrwizardstudios.com/

NOVA
http://www.pbs.org/wgbh/nova

Bill Nye
http://www.nyelabs.com/

The Blue Planet
http://www.bbc.co.uk/nature/programmes/tv/blueplanet

Beakman's World
http://www.beakmansworldtv.com/

3-2-1- Contact
http://en.wikipedia.org/wiki/3-2-1_Contact

The Magic School Bus
http://en.wikipedia.org/wiki/The_Magic_School_Bus

Then of course there are all of the primetime shows that incorporate science and visual effects, such as the CSI series, Star Trek, X-Files, etc.