Ganzeer, an Egyptian artist, is featured in an interesting article from the Guardian a couple of weeks back:
Egypt’s uprising brings DIY spirit out on to the streets
“…in Tahrir and in protests all over the country, people got a taste for expressing themselves openly, and the government can’t easily regain that control over public space again.
“Creating graffiti involves taking ownership of the streets, just like we did during the uprising. And so of course it’s political, and illegal.”