Well, not sure when it happened, but if happened recently I guess it means he's generating enough cashflow to get the ball rolling and start setting up the company and hiring an accountant to handle things.
Not sure if this was there before, but there's also a EULA here: http://www.sublimetext.com/eula
(nothing fancy though).
Let's just hope we are getting close to an actual 1.0 release so he can get some real cash flowing, Not that it would make a difference for us, the users, as the updates are already extremely fast and bugs are usually squashed within days. But it would be nice for Jon to be able to make this into his day job.