Computer clocks are they for fun or for profit? I guess both. If you are doing international business, then I'm sure you'd like to know what the time is now in Tokyo, I know it's easy to calculate the time difference, but I guess it's not what most people like to do. That is the reason why most market traders put the analogue clock on the wall to see what the time is.

People like to have visually appealing clocks and it is confirmed by what Microsoft company is doing now. Old days there were just clocks in system tray, telling the time in format "10:41", for now in Vista you will find nice looking analog clock with looks more like wrist-watch clock that digital clocks.

Also, it's expected clock to have an alarm, to warn you about some specific date or time. Alarm can be configures to produce sound, run some program or do whatever they can to let you know about some time.

Clocks should not be ugly, so there are many analog clocks with custom designed skins, which are very nice looking. People like to put clocks like these on the computer desktop and share them with their friends.

By the way, why not to put expensive real clock on your work desk? If you have a large work desk and have enough money to buy a branded clocks then sure, it's a good idea, but you will not take it with to some business trip and somewhere else. So, people prefer to install clock software on their laptop in order to have a quick look at the clock face before calling to the Tokyo in the mid-night.

Accuracy! I'm sure your heard about atomic clock, this kind of clock is as accurate as we cannot even imagine! Why not have atomic clock at your desktop? Actually, it's very easy, just pay attention to the time synchronization feature in the clock. If it works properly you will be able to synchronize your computer clock with atomic time servers available worldwide.

Finally, people tend to buy some cheap copies of know clock brands, it is actually a bad taste, why not purchase an inexpensive computer clock, which will look like wrist-watch or be a computer screensaver or will just tell you what is time now in Tokyo.

As for choosing clocks real or better computer clock, pay attention to the following - clocks must be accurate, i.e. have an atomic time synchronization, they must have some reminder or alarm to keep your organized and for sure, they must be very nice, so you will be happy to should them to your friends.

If you are looking for clocks that will solve some specific task for instance will show the time in different cities all over the world, then consider searching and using so called, world-clock. There are different versions of world clock, so show the time as digits and some show nice-looking analog clocks. It's up to you what to choose.