It makes sense to put birthdays and other anniversaries in BBDB as described in section 10.3.1 of the Org manual. Why repeat information by putting it in the diary when you already have a contact entry in BBDB for the person? The only problem with this is that the anniversaries aren't marked in the calendar and don't show up the diary. Is there away to make the calendar/diary aware of anniversaries in BBDB?
Joseph