My apologies. But anyone who's worked on team projects (that involve meetings) can appreciate this: Doodle enables users to identify a set of dates and times, and then invite (potential) participants to register their choices online.
Addendum: My bad - of course it's about research. How many of us have been tortured by the madness of getting a full committee together for a prospectus or dissertation defense? I don't know what I was thinking.