Protesters have apparently taken Tohid Sq, a little north of Jehun where Moussavi was speaking and NW of 7 Tir.

What little I can cobble together: Sounds like the protesters may be steadily taking West Tehran, to the S, SW and W of the airport (looking at Google Maps), and pushing towards Central.  The government's going to have a real problem if they're pushed back from the North, too.

Be nice to America. Or we'll bring democracy to your country.