Christmas Day! Sometimes hubby talks me into letting us open one on Christmas Eve, but I usually hold out until the next day. We open one before breakfast, then the rest after. It's always more challenging with Christmas on Sunday - last time we waited until after church to open up the presents (not fun with a 4 & 6 year old). I don't think we'll have nearly as much under the tree this year (they're getting iPods and not much else from us, and we've finally convinced the extended family not to send much) so we may open presents before church. We'll just have to see what time everyone wakes up!