Web: When you need to schedule a time to meet or talk with people across different time zones, visit World Meeting Time to quickly set it up and send others the details. As well as being useful, it's an easy and good-looking interface too.
Set the meeting based on when you want it in your time. Drag the blue marker to your city in the world map. Each marker corresponds to one person in your meeting, and their time zone will be updated automatically after you set the markers to their cities. Hit 'Schedule Meeting' and specify the duration of the meeting, write a custom message if need be, and email it to everyone. The inbox notification includes a shortcut to add the event to your Google Calendar too. Quick and painless, this.