So a friend sent me a link to a free trail-building clinic (granted, she probably sent it to me because i'm pretty worthless as a trail builder )
anyways - i can't make it since it's in Indy - but perhaps someone else may be interested. It's more geared towards mountain biking trails, but i'm sure some of the info would be applicable - not to mention that Pedal The Red is building Mt. biking trails in the PMRP so that might be helpful too.