If you haven't already, check out http://www.redtrails.com/. For Seattleites, the amount of trail data in the Seattle area is staggering.

Heaven help the old school Print Guidebook publishers with resources like this springing up.

While it currently appears to be a Geography Thesis experiment, the potential for a site like RedTrails is huge : combined with better trail descriptions, improved organization of data and user-rated trails it might just be a force to be reckoned with some day