I launched http://findhandrails.com the other day. If you don't know what it is, check out the original thread (hate included)
You'll notice I'm still in the process of building the database up more for other cities, but take a look at the Milwaukee area for a great idea on what I'm going for with the site. If you enjoy, have a use for it, or would like to see a map go up in your area, don't hesitate to submit some rails of your own.