It's not just me who's enjoying the Snowstorm installed on my blog. By popular demand, and to give credit where it is due, I will reveal the source.
Thanks Scott Shiller, for making it possible for my blog and The Art of Consumption to be a snowy holiday funfest.
For those who may like to install a Snowstorm, you can find the project page at http://www.schillmania.com/projects/snowstorm/. It's relatively simple, but there's no one-click WordPress plug-in install. For JS newbs, if you really want it roll up your sleeves, download and follow the installation instructions. Once you have it running, you can play with the customization options.