Maybe I'm an optimist, but uh...pretty sure we've been here before and censorship didn't really cut it for Iran's government. The Neda video, Twitter, Facebook, Tor usage, cell phones. There's just too many ways for information to flow from Iran (or Burma or wherever) for any censorship to really be effective. The best ideas would be cutting off ALL access, or white-lists, both of which create serious issues for Iran in terms of being connected to the world.