I often have issues with attendees missing a conference call where they are dispersed over a number of time zones.  It seems that daylight savings time (summer time) and my odd time zone (30 minute offset here in Adelaide, South Australia) always seems to screw things up.

I've been using a countdown timer such as this to make sure that people know  _EXACTLY_  when the meeting starts...

http://www.timeanddate.com/counters/customcounter.html?month=11&day=24&year=2008&hour=18&min=00&sec=00&p0=5

The dynamic countdown is particularly important coming up close to the call.  What I find is that many people will look at the timer and work out if they have time to go to bed or if they should stay up (also a common issue with cross time zone calls).

Vote on including a feature like this in WiserEarth at... Contdown timer to an event