I observe John Moses Browning's birthday a day late so that it coincides with my own and I can therefore justify sleeping in. We'll get the free ice cream machine cranked up shortly.
As an aside, one of the more interesting artifacts of the internet age is that the most popular web forum software packages send out automated "Happy Birthday!" emails to registered members. Every year, therefore, if you're an internet nerd like me, you get presented with an inbox full of birthday greetings from every forum at which you have ever registered. "GoldfishBreedersChat.com? When was I there? And why?"
EDIT: A birthday shout-out at SurvivalBlog.com! That's pretty cool. :)