In case anyone who's interested doesn't already know this, Andrew Sullivan has been posting lots and lots of info about the aftermath of the Iranian election, though as he acknowledges, he's not holding his info up to strict journalistic verifiability standards. Lots of material from Twitter, for example, especially from #iranelection.
There's a fair bit of debate in other parts of the blogosphere (and presumably the rest of the world) over the legitimacy of the election results; see the comments thread to that post for some disagreement with it.
I don't have enough information to have an opinion. But it's clear that there's a widespread belief, both inside and outside Iran, that Ahmadinejad stole the election, and there's a lot of material that, if true, is damning. And regardless of whether the election was legitimate or not, the powers-that-be in Iran are clearly handling the aftermath very very badly.
If you're interested, here are some amazing and compelling photos and videos of what's going on in the streets of Tehran.