They have integrated Paysius.com, so they are now accepting Bitcoins for registration.
This year, I'm setting up a full Bitcoin exchange as a vendor on sight, and will be preaching the good word. Ira Miller, Charlie Shrem, and Roger Ver will also be in attendance, as well as at least one girl from GirlsGoneBitcoin Bitcoin will be almost as prevalent as conversations about building roads without governments.
So, if you're going and haven't registered yet, GO NOW and pay with Bitcoin! Select Bitcoin during checkout: https://freestateproject.org/registration/porcfest/2012