UPDATE: Keep Twitter Up for the People of Iran

UPDATE (4:40 pm PST) Twitter has agreed to forgo the scheduled maintenance!

Official statement:
Down Time Rescheduled
A critical network upgrade must be performed to ensure continued operation of Twitter. In coordination with Twitter, our network host had planned this upgrade for tonight. However, our network partners at NTT America recognize the role Twitter is currently playing as an important communication tool in Iran. Tonight's planned maintenance has been rescheduled to tomorrow between 2-3p PST (1:30a in Iran).

Our partners are taking a huge risk not just for Twitter but also the other services they support worldwide—we commend them for being flexible in what is essentially an inflexible situation. We chose NTT America Enterprise Hosting Services early last year specifically because of their impeccable history of reliability and global perspective. Today's decision and actions continue to prove why NTT America is such a powerful partner for Twitter.

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There is a scheduled site maintenance tonight on Twitter, which will suspend usage for a time. The people of Iran are using Twitter as one of their only means of mass communication both domestically and internationally. If you are on Twitter, please send a tweet asking to forgo tonight's routine update to the hashtag #nomaintenance.

Meanwhile:

Here's a link to a Boston.com posting with a slew of really unbelievable hi-res pics.