It is a rare thing for me to advertise. But, today I make an excellent exception: I want to make a plug for my brother's new program - Operatus.
His company, Method in Mind, has put together a solution for getting a bunch of people together in one place at one time. Anytime I've had to group people for meetings, movies, dinners, whatever - I've had to pull out my hair trying to get everyone on the same page. Here's a neat system that uses e-mail and a browser. It's set up for a free trial, so give it a run. :-)