Thankyouthankyouthankyou I have stupidly lost the link to this site and was unable to find it since. I've also used http://timeanddate.com/worldclock/meetingtime.html, but it's not nearly that usable.
I just tell people to use Swatch Internet Time when setting up meetings. Also known as Biel Mean Time, it has no Daylight Savings Time, and it's the same everywhere in the world.
For instance, if I type in "10pm Taipei" it will tell me the corresponding time here (SF, CA), which is 6am PST.