Developers should all be well aware of the annual holiday closing and plan accordingly. App store sales on Christmas Day have been very high. Here's Flurry's report from last year as an example: <a href="http://www.mobilecrunch.com/2009/12/28/flurry-app-store-sees-record-breaking-christmas-50-growth-from-november-to-december/" rel="nofollow">http://www.mobilecrunch.com/2009/12/28/flurry-app-store-sees...</a>