I was there! they placed newspapers and towels on the floor so we wouldn't pray on the hot asphalt, I love Egyptian Christians and although I am Muslim I would die defending any one of them.
This picture of Christians protecting fellow Muslim protesters as they prostrated themselves to pray is worth bearing in mind while Mubarak talks his nonsense about not being able to leave lest the roiling mob destroy the country.
Egypt, our hopes and energy join you today. Get what you're fighting for and don't stop until. The time for in-between is over.