I have sometimes checked this site :
http://en.wikipedia.org/wiki/List_of_Oh_My_Goddess_episodes#Season_2_.282006.29_-_Ah.21_My_Goddess:_Everyone_Has_Wings
Nothing about season 3, but every tv episodes.
And I found this, some season 3 info :
http://www.goddess-project.net/
02-Mar-2007