Here are various links about the Pittsburgh G20 situation:
First Person Accounts
Girl who held Tower Doors Open and was arrested, injured by police “assault”
The Oakland Arrests From the Eyes on Fire blog of Pittsburgh Post Gazette reporter Michael Henninger
G-20, No Zombies & Me An account of what it feels like when your city is taken over by “security” measures.
http://www.whathappenedatpitt.com/ first hand accounts are on the forum there
Pittsburgh’s Little State of Siege -James Henry. ” the only real ‘clash’ that occured in Pittsburgh last week was between off-the-wall lawless policing and the Bill of Rights.
Pitt to allow lawyers for students in police meetings Pittsburgh Post-Gazette
http://www.whathappenedatpitt.com/ lists links to articles, police scanner reports and websites referrencing G20 Also has a forum.