Looks like Sidereel.com has set up their own campaign to save Dollhouse. If you have facebook or twitter, you can also share links with your friends/followers. Sidereel is urging ppl to send the Prez of FOX some Dolls in an effort to renew the show, here's some info:
Mail dolls and letters to FOX:Kevin Reilly
President of Entertainment, FOX Broadcasting
10201 W. Pico Blvd.
Los Angeles, CA 90035
Email: kevin.reilly@fox. com
And yes, I think we should crash his inbox with letters =)