We know where these guys are, I am certain. By now, we have significant intelligence presence on the Baghdad streets and within some military and civilian elements. One of the overlooked benefits of our very precise bomb targeting within Baghdad is that there is a thriving bustle throughout the city during the daytime hours. They feel relative security from harm. That has enabled our spies and covert operatives to move about more widely and unobtrusively. If Baghdad was buttoned down, the intel efforts would be severely limited.
I agree that somebody on the ground knows who they are and where they are. I bet the members of the SRG aren't feeling all that secure though.
This has been a masterful campaign. You can bet the leaders of other countries have noticed. This is a new kind of warfare, and we play for keeps.