I haven't used Twitter yet either, and I don't feel particularly inclined to. However, I agree that such technologies (along with the internet generally) will bring about a huge increase in democracy in the world, including right here in the US (already has to a large extent with the election of Obama, which was assisted to a great extent by the internet).

For those who are Twitter savvy, apparently the people Twittering in Iran need people to set up proxy services for IP ranges inside Iran. The addresses can be sent to some of the people who are using facebook/twitter from Iran. And people can post the proxy information on Twitter under #iranelection with the words 'proxy in their tweet.