In response to very popular demand (to the tune of 150+ requests on the Labs CS3 forum), I’m happy to say that Adobe is now making it possible for Windows customers of Photoshop CS2 to get a Mac CS3 beta serial number, and vice versa. To request a number, you can send mail to firstname.lastname@example.org & include your CS2 serial number.
We made this decision a couple weeks ago, but I didn’t want to publicize it widely until the staff was back at full strength after the holiday break. Please note that this is a manual process on our side right now, and we appreciate your patience as we handle requests.
Related: If you find that you want to switch an Adobe product license from Mac to Windows or vice versa, please contact Adobe Customer Service. They’ll walk you through the process.