Use all the resources you have at hand. I watched Bill Nye the Science Guy with my son pretty regularly, until it was canceled. I subscribe to the Planetary Society, and every couple of months they send a magazine with great color photos of stars and planets. I leave this magazine in his bathroom for him to browse through.

Buy books on conducting science experiments. There are many out there that are very kid-friendly (making 'gross' stuff in the kitchen, etc.)

Trips to a local science museum are a must.

Other TV shows about science and technology are great ways to get kids to think about new things. My son likes Mythbusters, Dirty Jobs, even lighter fare like Stunt Junkies and Robot Wars. NASA TV shows shuttle launches and landings live along with other things.

Scientific American produces a daily podcast called '60-second Science' and I e-mail my son those that I think he might be interested in, like the one about the baby spiders that suck their mother's dry for nourishment.

Even your own enthusiasm about science can be infectious. At the dinner table, I often try to think of newsworthy topics to think about. Just this week, I burst out, "Hey! Did you hear about the MESSENGER probe skimming past Mercury today? We're now seeing parts of it we've never seen before!"

The proof of concept came when someone asked my son what he wants to be when he grows up. His answer, with no prompting from me, the answer that made my heart want to swell up and burst? "A scientist."