If you ever need to schedule an online meeting or a conference call with multiple people who work in different time zones, a web app called Every Time Zone should come handy.
Every Time Zone offers a unique view of the time zones around the world that is less confusing and you simply have to drag the green bar on either side to figure out the best time that may be suitable for all the meeting participants.
This is an HTML5 based app so it should work on most browsers except for IE. And since this is pure HTML, you can even use it in offline mode. Thanks @SwissMiss.
Related: Online World Time Clocks