From George’s site:
Today 11/3/09 is a sn0w day.
School is officially cancelled, and all your iPhones will be unlocked. Remember getting those calls? At Noon EST, I will be making it sn0w, and I’m looking to see “#blacksn0w” trending.
Blacksn0w is the unlock for the latest 05.11.07 baseband, and will also enable official tethering. blackra1n, a jailbreak for 3.1.2, has been updated to RC3, with hacktivation support, 15 second speed improvement, Tiger+PPC support, and installation of the latest blackra1n.app.
Read more at http://iphonejtag.blogspot.com/2009/11/sn0wday.html