Here is a recent article from the NY Times on needle exchange in Russia - http://www.nytimes.com/2009/11/22/magazine/22FOB-idealab-t.html?pagewanted=1&ref=magazine
And, here is the site for the needle exchange program in Ithaca – Prevention Point. This organization is always looking for volunteers, so check them out if you are interested. http://www.stapinc.org/prevention-prevpoint.html