Don't forget to put your clocks forward 1 hour before you go to bed tonight ;)
Also make sure you have installed the Daylight saving patch from Microsoft you can find out more about it here: http://support.microsoft.com/?kbid=933360 , http://www.microsoft.com/nz/msdn/timezone/itpro.mspx , or your computer time will be wrong tomorrow.
Tonight Daylight saving starts.