After my previous post, I went to the Adobe store (which wasn't working last night). When you want to buy the upgrade to PS/CS, it says: "To install upgrade successfully, you will need a licensed version of Photoshop 7.0 or earlier on the same platform as this purchase."
http://www.adobe.com/store/products/...d=catPhotoshop
Sounds to me like those of us with PS6 will be ok.
Regards,
Andy Pearlman
Andy Pearlman Studio