Comparing the photographs from Egypt in 2011 to those from the post-election demonstrations in Iran in 2009 - there are almost no women demonstrating in Egypt. In the Iranian protests, women were front and center, at least on the documentary record. Says quite a bit about the differences between these two societies and the protest movements.
Some people are worried that Egypt might turn into another 1979. I think it would be hard to repeat an Islamic Revolution in Egypt today. Even if Mubarak were to fall, it's unlikely that a militant cadre of Islamists would be able to turn the whole protest movement into a revolutionary transformation of Egyptian society, eliminating other opposition movements and cutting off ties to the West.