The Futures Channel includes a large collection of movies with related activities for kids (and big kids, like me!) I really like the one with Dava Newman (an amazing engineer!) talking about futuristic space suits. Another provides hands-on math activities to go with a video about robot-builders from NASA. The videos would be good to use as a focus, followed by the activities that connect back to them. You could even have a whole club that does one of these a day.
Thanks to Mike on the ITEA Innovation Station list for the reference!