The Smithsonian Channel has a lot of features on their website to follow along with their programming.
For example, on the Aerial America page you can find where the planes are flying and filming right now. If you have a favorite spot in West Virginia they need to know about, you can comment on this page to suggest a filming location.
They branched out into the social media image sharing platform. You can click through their boards to view some stunning photos from around the world or read some interesting stories.
You can watch full episodes for free either on the Smithsonian Channel website or through iTunes. iTunes offers a broader range of programming, but you will have to pay for some episodes.
For tablet and smartphone users, the channel has a free app. You can watch video clips, check on the schedule of programming and test your knowledge with arti-FACTS.
They have an entire section devoted to kids that explores extra digital content for their children's programming.