Utech has a great little World Time clock program that sits on your desktop and displays the time for any time zone you choose. You can select several different clocks at once, so you can see what time it is where all of your friends and family live! It's great for business use, as well. It is free to try, and inexpensive to purchase. It's one of the few things I am willing to freely sponsor and recommend.
(Images: Time zone map. Source: Google Images; A folding screen depicting the battle of Kawanakajima in 1561. Source: Postcards)
