We run Iron Chariots (http://wiki.ironchariots.org/index.php?title=Main_Page), which is probably what you're looking for. Another great resource is talkorigins.org for debunking creationist claims, especially their index to creationist claims (http://www.talkorigins.org/indexcc/list.html).
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From the officers:
The next ACA Board Meeting will be Sunday, August 2nd at 1pm at the ACA Library, 1507 W. Koenig Ln.
The annual ACA Bat Cruise will be Saturday, September 26 at 6pm. Order your tickets via our products page.