Here a few ideas from EffectiveMeetings.com on the topic of staying on time:

* State that the meeting will begin promptly at the scheduled time and that all participants should be on time.

* Send a reminder e-mail thirty minutes before the meeting begins and encourage meeting participants to arrive on time.

* Ensure that you begin the meeting at the scheduled time. If you've encouraged others to be prompt, don't embarrass yourself by showing up late.

* Close the meeting room doors at the scheduled time.

* If your meeting starts a little late, still finish the meeting at the scheduled time. It's inconsiderate to assume the participants' schedules revolve around your meeting, so wrap up the meeting when you promised.

* Consider creating a "latecomer jar" to which meeting participants must contribute one dollar for each minute they arrive late to meetings. At the end of the week, you can buy muffins or donuts for everyone who attended the meeting… courtesy of the latecomers!