For the first time ever, Adobe is delivering a widely available Photoshop CS3 beta to enable customers to more easily transition to the latest hardware platforms, particularly Apple's new Intel based systems. The beta is available as a Universal Binary for the Macintosh platform as well for Microsoft Windows XP and Windows Vista computers, with the final shipping release of Adobe Photoshop CS3 planned for spring 2007.
The Photoshop CS3 beta is available in English only but to Photoshop CS2 users worldwide. It is available to licensed users of either the Photoshop CS2 (full, upgrade, and education), Adobe Creative Suite 2 Standard or Premium (full, upgrade, and education), Adobe Production Studio Standard and Premium (full, upgrade, and education), Adobe Video Bundle (full, upgrade, and education) or Adobe Web Bundle (full, upgrade, and education). You will need to provide your Photoshop CS2, Creative Suite, Production Studio or Bundle serial number in order to get a Photoshop CS3 beta serial number, enabling you to activate the Photoshop beta and use it beyond the two-day grace period.
you can download the software from the Adobe labs website.