As Iranian activists protest the election results (current President Mahmoud Ahmadinejad declaring reelection victory over opponent and former Prime Minister Mir Hussein Mousavi - and just one day after the election instead of the customary three), you can follow up-to-the-minute reports on Twitter from the Tehran Bureau:
http://twitter.com/tehranbureau

You can also check out their blog:
http://tehranbureau.com/