I knew that such a tool as “map my ride” must exist somewhere, and I just now found it while poking around on the excellent Souhegan Cycleworks website (I like how they rate local hills!).
My cycle computer seems to have crapped out (fresh batteries didn’t fix it), so I have no way of knowing how [...]

It struck me that it would be useful to put together a bunch of links for online trail maps all in one place.So, I’m working on it. I’ll add more as they occur to me, and as always I welcome suggestions:
Bear Brook State Park, Allenstown: http://www.snemba.org/bearbrooktrails.jpg 
Beaver Brook, Hollis: http://www.beaverbrook.org/PDFs/bbmap.pdf
Cohos Trail: http://www.cohostrail.org/
Dunstable, Mass: http://web.mac.com/leedingle/iweb/drlt.org/Overview%20of%20Dunstable%20Conservation%20Lands.html
Fort Rock, Exeter: http://www.nemba.org/ridingzone/Fort_Rock.html 
Gap [...]