A nice set of photography tips for the upcoming festivities from Digital Photography School
14. Watch Your Aperture
I quite often shoot in Aperture Priority mode on a day like Christmas and am constantly changing the aperture depending upon my subject. For example when taking shots of a Christmas decoration on the tree I'll select a large aperture (a small number like f/2.8) so as to throw the background out of focus, but on a shot taken from the end of the table of everyone sitting down eating I'll choose a small aperture (like f/8 to f/11) so as to have a larger depth of field and keep everyone in focus.
[Tip'O'Hat to Lifehacker for the link.]