If you use iCal and you are now on Leopard, make sure you check out the new widgets that are available for defining repeating meetings (they are shown below). When you are scheduling an event, you can select "Custom..." under the repeat entry to get these menus. They've done a really nice job of making these more flexible in Leopard. Now if you have a weekly meeting that repeats every week on Monday, Wednesday, and Friday, you can add the meeting once and use this cool new widget to make it repeat all of those times. Prior to Leopard, you pretty much had to create a separate meeting for each day, and then repeat that weekly.