What can I do with my extra plastic grocery bags?

My roommate and I have accumulated quite a collection of plastic bags from grocery shopping and they’re starting to get to be a nuisance. My roommate wants to throw them away, but I really don’t want to! They’ll just end up in a landfill doing no good and not decomposing. Are there any organizations in need of plastic bags that I could give them to? Can I recycle them somehow? Are you, an honest jelly, in need of lots of plastic bags?