Here’s a cool idea.
From the site:
I’ve just finished building CommitteeCaller.com, a site that allows one person to target an entire congressional committee over the phone. The web application utilizes the open source Asterisk PBX system to connect you to every senator or house member on a particular committee. No more digging around the ‘net entering zip-codes to retrieve phone numbers of representatives — CommitteeCaller.com automates the tedium of repetitively dialing your favorite politicians.