There is a book project in progress by Kai Behrend, Brian Conrad, Dan Edidin, William Fulton, Barbara Fantechi, Lothar Göttsche and Andrew Kresch. It has not been completed yet and it is not clear when it will be, but I find the existing chapters quite useful.
http://www.math.uzh.ch/index.php?pr_vo_det&key1=1287&key2=580&no_cache=1
