Topics have ranged from the basic "What is a Watershed?" to "Geologic Morphology of the Ozarks" to "How to Build a Rain Garden." And now you can see all of them to date online. Scroll down to "Watershed Awareness Luncheons" and click on that link. You can currently choose from six lunches.
This series is such an incredible resource and considering the policy decisions coming before us in 2010 (Streamside Protection Ordinance, Low Impact Development, and Stormwater Utility) these are very timely as well.
And as a nice sidebar the lunches are all organic and zero waste is created during the event.