I have pre ordered the new operating system from Apple and will be installing it as soon as it arrives.
I will then be able to tell if it messes up anything Photoshop related and let you know.
Any existing clients may wish to resist the tempatation to upgrade until then. Its not likely to impact productivity much but I will benchmark Photoshop CS3 before and after upgrading to see if there are any speed changes.
Stephen
http://store.apple.com/Apple/WebObjects/ukstore.woa/wa/RSLID?mco=7FD5D34F&fnode=home&nplm=MB021