A couple of years ago I was fortunate enough to land on a campus committee that was charged with re-examining whether we wanted to renew our license with WebCT, or to jump to a different CMS. I was quite pleased that we made the switch to BlackBoard, because I found it easier to offer library support through that platform. Of course your mileage may vary. But if any of you are helping your institutions decide which CMS to use, this site shoudl prove enormously helpful - I wish it had existed when we were making our decision!
Information on 64 different CMS's allowing you to compare and contrast on just about any criteria. Nice.