Have you heard of Freecycle? It's a network (organized by geographic area) that allows people to post items to give away (for free -- never for sale/profit) or to ask for items they need. I love using it -- sometimes those weirdo items that I know won't sell at my garage sale or get picked up at the thrift shop can find their way into just the right homes (and you know I'm nutso about having my things go to "good" homes). Besides -- it's free!
I've gotten rid of a lot of items via Freecycle. My favorite part are the "wants" which I read faithfully, hoping that one of my sacred clutter items could be loved by someone else. Once someone posted that he needed a specific kind of kitchen stool and he posted a photo. I had EXACTLY that stool in my closet where it had sat, untouched (except by dust) for 5 whole years. I know this because I put it there when I moved to this house and haven't used it since. I don't know why, but I couldn't bear to part with it but as soon as I knew someone needed it .....off it went!
If you are having trouble getting rid of unusual/random/strangely specific items, try Freecycle! Be safe, though -- remember that it's a public forum and not everyone on there is a Boy Scout.