Arrange a meeting in multiple timezones

Lots of people are using Yahoo’s Upcoming more and more these days, going by the invites I get (many have switched from using Facebook to using Upcoming recently). But it completely sucks for arranging anything in a foreign country, or where people will be attending from foreign locations. Common examples:

• Any meeting, event, or party at an international conference; many attendees will be flying in a day or so beforehand
• Conference calls with people in more than one timezone; conference calls tend to be with multi-timezone, otherwise you’d just have a face-to-face meeting

I’ve tried lots of things, and although Outlook 2003 and beyond have some moderately handy tools for this (you can view “2 timezones simultaneously”, although IIRC *only* 2, sigh), 99% of the time I need something web-based that anyone/everyone can use. And today I found this piece of awesomeness:

http://www.timeanddate.com/worldclock/advmeeting.html

…which produces things like this:

(I would insert an image here, but unfortunately – despite the claims of the Debian maintainer of WordPress – Debian WordPress still can’t do file uploads, and WordPress’s authors haven’t fixed their extremely poor approach to file uploads. Sigh)