Generally speaking, unless you or your company run a time-sensitive application, at worst you will need to manually set the clock on your computer forward an hour. The other exception is if you run software to manage your schedule. If you manage your calendar on your computer (or PDA), you should check for an update from the software developer. Regardless of what you do, simply be aware of your appointments for the first few days of the new Daylight Savings Time and make sure your appointments aren't set for one hour later than they should be.
If you're running Windows XP, make sure you run Automatic Updates (or have run it recently), and your PC should automatically take care of the time change. Older versions of Windows should download and run the utility "EZ Time Zone". This tool is also nice if you need to update several machines across a network, or if you don't want to run Automatic Updates on Windows XP.
If you use Microsoft Outlook, you should download and run the Outlook Time Zone Tool - http://support.microsoft.com/kb/931667
Mac OS 10.4 users should make sure they've updated to Mac OS 10.4.5 or later, and also downloaded the latest Apple DST update. Mac OS 10.3 users should make sure they've updated to 10.3.9 and downloaded the latest Apple DST update. All these updates are available via Automatic Software Update.
Mac OS Classic users should read this article I've written - http://www.marcelbrown.com/techbytes/2007/03/mac_os_classic_and_daylight_sa.html
Palm OS users should download the Daylight Savings Time Update - http://www.palm.com/us/support/downloads/dst_palmos.html
If you have any questions regarding the new Daylight Savings Time and your technology, please contact me as soon as possible.
