BusinessWeek has an article on Virgin Galactic, with a few more details than I’ve seen elsewhere:

Branson’s dream has been in the making since at least 1995. But it wasn’t until two days before SpaceShipOne’s first X-Prize-winning flight on Sept. 29 that Virgin announced its timeline for developing space tourism. The $21.5 million deal with Paul Allen’s Mojave Aerospace Ventures (the company that funded designer Rutan and owns the rights to SpaceShipOne), allows Virgin to build as many as five souped-up versions of the initial prototype SpaceShipOne.

Nice, five souped-up spaceships, aiming at up to 104 flights per year. Also, the first ship is to be called the VSS Enterprise. Now they just need to get Captain Kirk on board the maiden voyage.