It looks as if the "Keyport," which was shown as a concept a few months ago, will actually be making it into limited production. Your likelihood of getting one seems slim, though: you'll need to have already been on the "I'm interested" list; the process for getting your keys cut involves sending six copies to the company; the whole thing cost $300. Maybe you could just drill a hole through your keys and pin them all together instead? Or what if someone made a small, metal ring...?
KEYPORT PRODUCTION [Notcot.com]