We have recentally found three good science resources...

The Great Backyard Bird Watch
Watch for birds and record your results online
Valentine Weekend Only but other projects throughout the year

Galaxy Zoo
Help Scientists classify galaxies and keep an eye out for solar storms

Academy of Science St.Louis
Seminars and other activities covering many areas of science in the St.Louis area

Here's a good-un too:
http://www.woodlands-junior.kent.sch.uk/teacher/science.html