Anyway, the thing I like: In Outlook 2003, if you created a repeating event (say, "Spring break, every day from March 19 to March 23") and then copied it to another calendar (because, say, you maintain calendars for five different groups and three meeting rooms), only the first day copied and you had to set the repetition on each calendar.
In Outlook 2010, if you create a repeating event and copy it to another calendar, you get a little pop-up that offers you the choices "Copy series," "Copy selected occasion," and "Cancel."
This is a goodness.