I have one holiday short story out, Peppermint Passion, and one coming out this week, Adore. I found PP sells on and off during the year, but sells great around the holidays. Because they are short stories I can deal with the 'meh' off season sales in exchange for good sales during the three month holiday period.

Also, both books are short stories so I didn't invest a huge amount of time into them like I would with a full length novel.