Arizona Endurance Series
Antelope Peak Challenge January 27, 2008 (previously posted before this schedule was finalized)
Du Run Run Duathlon February 2, 2008
Kentucky Camp Epic March 9, 2008
Arizona Spring Fling March 12-16, 2008
Sedona Big Friggin Loop April 13, 2008 (post-race/ride party at brewery)
Coconino Dirty Century May 24, 2008 (post-race/ride party at brewery)
Rock y Road 50/50 October 18, 2008
More can be found at the AES website. These races are for mtbers that like to be on their bike for long periods of time and see rarely seen singletrack. All races are free, with participants ranging from 15-74 like-minded riders.
Also, more info can be found at the AES google group.