Have any of you used http://www.motionbased.com?
They allow users to log their GPS tracks and keep track of the stats, such as mileage, elevation gain, gain per hour, MPH, etc.
There are millions of tracks for everything from Mountaineering to Sailing.
I find it hard to search, but have found good GPS tracks there for San Gabriel hikes.
A similar site is http://everytrail.com, only a small number of GPS tracks for the San Gabriels.
Travis