Just an FYI on a new KB we published today that's proven to be fairly popular:
Symptom: MOM 2005 Reports with an end date of 01/01/2010 or later result in incorrect date values on the X-axis.
Cause: This is due to the SC_DateDimension_table in the SystemCenterReporting DB not containing dates past 01/01/2010.
We have a script to fix it here:
J.C. Hornbeck | System Center Knowledge Engineer