No? Well it's about time you started thinking about it then! :-)
In the meantime, check out these resources:
1. Mark Brownlow collects useful holiday email marketing articles/reports from around the web in a resource list. Here's last year's. I'm sure he's already working on the 2011 article, so make sure to subscribe to his RSS feed or mailing list to find out when he publishes it.
2. Silverpop has a nice holiday email marketing strategy checklist that I'd like to share with you here:
3. Check out this Retail Email Guide to the Holiday Season by Responsys:
4. Good luck with your holiday email marketing strategy! And if you need any help, don't hesitate to contact your favorite email marketing consultant! :-)