Try freecycle.com. You list what you have and what city you are in and people will respond very quickly if they want it. My experience has been that everyone is very good about picking it up very quickly also, especially if you mention that need in your original listing of what you want to give away.
I know a lot of people use Craigslist.com for a variety of things.
I've seen big trucks for Salvation Army that you could try. Once I've tried freecycle.com I like donating to the Rescue Mission which I think is in Camarillo. I live in Westlake and they still come here to pick things up but I haven't ever had furniture so I don't know if they pick up large items like that.
Hope these help.