A new (non-ES) 6.1.3 update is available as of March 31st of 2009. This version shows up in the FIXED-IN column of the CSCsy25150 bug description. But the Field notice FN63213 doesn't make me feel confident that this is the full fix.
I guess my question would be does 18.104.22.16890-1 (6.1.3bSU1) fix only the March DST issue, or the November one too?
There is little reason to apply a March 8 thru 15 fix now that we are past Mar 15, so I would like to think that this is the bugfix for all known DST problems.