Utopia, they are there. Once you get involved - they find you!
You can search for rescues in your area to see if they need help:http://www.pets911.com
or you can search through rescues that have pets up for adoption at http://www.petfinder.com
in your area - contact them to see if they know of any TNR orgs in your area (fostering is actually also a really helpful way to help rescue!).
You can sign up as a Feral Friend at Alley Cat Allies:http://www.alleycat.org/NetCommunity/Page.aspx?pid=253
And you can sign up to be available for trapping as part of the Best Friends Network:http://www.bestfriends.org/nomorehom...ts/thenetwork/
We live in a rural area, and started by borrowing a trap from the vet. Once it became apparent that once you get involved, the cats find you... well - an investment in our own trap just made sense.
There's lots of info on both of those national rescue sites, more in the links in my signature line, and LOTS of help with every aspect of rescue in the Caring for Strays and Ferals forum.