Still having trouble with the "small brown songbirds" category. They all look too much alike for me. However, having about.com's awesome 'birds of Phoenix' to cross-reference against my field guide is helpful. I have identified birds 2 & 3 as House Sparrows. 1 & 4 are mysteries to me. I think they are the same type of birds even though the pics were taken in two different places ( #1 my apartment in Mesa and #2 Gilbert Riparian Park). Sorry about the horrible quality of the photos. I need a new camera.