So I thought I'd spread some useful links:
Here is arian1 's LJ that has some great coverage of the events
Andjwaneeta has a brilliant collection of facts about the major players in this here
Here is the daily dish again.
and a forum about what's going down there and also how you can help with proxies, etc.
Here you can find some very impressive pictures
A site that crunches the numbers in case you have to explain to anyone, why this election is considered rigged.
For some offline education on Iran I recommend:
My Iran by Shirin Ebadi (about the 1979 revolution and current situation)
We are Iran by Nasreen Alavi (about the iranian bloggers)
Persepolis by Marjane Satrapi (brilliant comicbook and film)
If you have some more other links that you want spread, please post them here.