You might have heard that changes are coming in the US with regards to Daylight Saving Time, specifically, the start and ending dates.  If you run any MS product, you're likely to be affected.  Some products will not need to be updated (Vista, Office 2007) but most will.  Most can be patched automatically, but some will need manual intervention.  For all the latest, check out the website at http://www.microsoft.com/windows/timezone/dst2007.mspx.  Sooner is better than later, especially if you manage lots of systems; the new DST starts on March 11, and you'll need to patch before then.