If you are looking for ways to incorporate STEM (Science, Technology, Engineering and Math) activities into your programming for kids, here is another great resource! A Wiki, set up to collect ideas for programs. The submissions I sampled were great, with lots of specific suggestions it would be easy to adapt for your program. They are soliciting submissions, too, so this is a great way to share your terrific ideas (I know you have 'em).
Check it out here: http://simplystem.wikispaces.com/Welcome+to+Simply+S.T.E.M