I've recently discovered Doodle - www.doodle.com.
This is a useful tool for scheduling meetings and the basic version is free. You create a poll with a number of possible dates and times for the meeting and send a link to the attendees. Everyone then 'votes' for the dates and times that suit them. It can also connect to a Google or Outlook calendar and there's an iPhone app too, if you're that way inclined.
As this is a poll, it is very flexible, so you could use it to decide on a venue for a meeting or day out as well.
The website isn't pretty but Doodle is a useful and free tool, which is why it's October's website of the month.