I don't know any angry atheists. I'm not. I'm normally a pretty mellow guy as are my atheist friends. But I do get angry with religion on occasion. I think it's best summed up for me as I'm tired of having religion and religious people stick a a big nasty finger in my eye. I respond through writing and activism. There are over 5,000 posts on this blog. Most are manifestations of my simple form of anger.
And… I love Gretta Christina. She tops the list of atheists I want to meet.