Display Different Time Zones in Desktop

In my day job, I have to work with various teammates across New York, San Francisco, Hong Kong and China all the times, and the difference of time zone is just beautiful. We can work like 24x7 without break. However, the time difference always give confusion to us (or only me? PST, EST or Hong Kong Time?)

Therefore, I need a tool to display and show me the time and schedule in different time zones. I'm pretty sure I saw few demos and tiny app does this, and I also know that Vista have the ability to display various clocks (on the side bar (or it's called Gadget?) but I'm looking for something that must be very light and able to work without connection.

I used TimeAndDate.com and the scheduling ability in Outlook in the past, and it work nice for my cross-boundary scheduling, but none of these show me the precise time especially when I'm connection-less...

Thanks Nam, who are an advanced IT Pro and he recommended a lite tool to me - MS Time Zone. It just sit in the task bar silently and pretty small in size (It cost me 6Mb memory as shown in the Task Manager). What's your choice? Which one do you like most? :)

Colt Kwong