Yes, we are also seeing this in SAM 6.0 RC3, particularly with the 2008 Domain Security Controller template. There do seem to be lots of MS KB articles around WMI leaks etc.., but I can't find one that precisely describes the scenario and we are loathe to go down the path of trying out combinations of multiple MS WMI patches. Did anyone ever get a surefire solution to this?
As side note - I accidentally deleted the 2008 Domain Security template itself instead of removing it from the monitored nodes, oops 
Does anyone know where can i get a copy to re-import, are they still on the server disk?