Just wanted to org-clock-in and stumbled over world-clock, which must be part of #emacs since 23.1. I guess there better tools to schedule a meeting across timezones, but it's still pretty handy to give a quick overview.

Los Angeles Sunday 24 November 19:50 PST
New York Sunday 24 November 22:50 EST
London Monday 25 November 03:50 GMT
Berlin Monday 25 November 04:50 CET
Bangkok Monday 25 November 10:50 +07
Tokyo Monday 25 November 12:50 JST