Just found this great group, Help A Reporter. It started on Facebook but got too big so has evolved into a website. The guy who started it all is Peter Shankman and this is how he explains it...
"Each day, you'll receive up to three emails, each with anywhere from 15-30 queries per email. They'll all be labeled with [shankman.com] in the subject line, for easy filtering. If you see a query you can answer, go for it! HelpAReporter.com really is that simple.
I built this list because a lot of my friends are reporters, and they call me all the time for sources. Rather than go through my contact lists each time, I figured I could push the requests out to people who actually have something to say.
These requests only come from reporters directly to me. I never take queries from that other service, I never SPAM, and I'm not going to do anything with your email other than send you these reporter requests when they arrive in my in-box."
Pretty neat. and yes, it's free :-)