For clothes there used to be a charity that was looking for professional clothing to give people to use for job interviews, etc. Can't recall the name though, but perhaps someone else will. For everyday clothing best bet is whatever is easiest. They may sell it or ship it to some third world country, but chances are that it isn't going to end up being worn by some deserving charity case here.
For furniture one option would be ACCA. It stands for something like Annandale Christian Community for Action. Website is
http://accacares.org/ They used to provide pickup for furniture and would take bedding.