It's easy to make your own arrangements, via http://my.barackobama.com/page/content/statepages. Choose the state where you'd like to volunteer. Follow the prompts from there.
If you're not able to go to the States, you will be able to help mobilize US-based voters by participating in the phone banks that Obamalondon will coordinate with Obama for America in the weeks leading to November 4th. If you're on the Obamalondon mailing list you'll be notified when we're set to start. Please pass along our email address to friends and cohorts who might want to join this vital initiative. (firstname.lastname@example.org)
Meanwhile, there's much to be done to get out the overseas vote. Please scroll down for forthcoming GOTV events, and watch your inbox for updates.