I'd rather forgotten about these birds, and thankfully am not (so far) plagued with them. Still seeing/hearing them now and again, but they have not moved in like the starlings (yet). In response to Tom, here's my best stab at the difference between the two (use your most creative imagination, ha ha)
Mourning dove: woo AH woo ... hoo hoo (usually only 1-2 times)
Collared dove: woo HOOO hoo ... woo HOOO hoo (repeated several times)
Probably not as sanctioned by Audubon, but that's what I hear.
