11/5/2008 -- You can display multiple time zones on Vista easily without modifying the registry or rebooting your computer. Here's how:

1. Click on the system clock in the lower right-hand corner on the taskbar.
   
   
2. Click on "Change date and time settings."
   
   
3. Click on the Additional Clocks tab. Here, you can add a couple of additional clocks to display the time in other time zones.
   
   
4. Simply check the box "Show this clock" and from the drop-down button select the time zone. You can enter any display name that you want. For example, you might want to display Pacific and Central time zones and label them as such, or select time zones from different countries and label them accordingly.
   
   
5. Click OK and you're done.

To view multiple time zones, you can simply hover over the taskbar clock. You'll notice the Local time and your additional time zones listed in the order you picked them. If you click once on the clock, you'll see a graphical view of the multiple clocks on the right side along with the monthly calendar on the left.