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.
Just go to the website, select a committee, enter in your phone number and click "Put me in touch with democracy!" and you'll be called by our system and sequentially patched through to the front office of each member on that committee. You can even rate how each call went -- information that will enable us to rank representatives on how accountable and responsive they are to their constituents.
This is an excellent opportunity to contact the Senate Select Committee on Intelligence -- the politicians who are debating today whether telecoms should receive retroactive immunity for spying on your phone calls and e-mail.