Winterpool

Adobe's CS4 Should Give Apple Sales a Boost

Unfortunately the original commenter is correct (at least partially): Adobe CS4 willl be 64-bit for Windows but not Mac OS X, despite the fact that almost all Intel Macs have 64-bit cpus and Leopard is arguably a 64-bit OS. Adobe attributes this to Apple's switch from Carbon to Cocoa (Adobe was developing its apps in the former). This has been known for months now.

www.macnn.com/articles.../

So, at the application level at least, you won't be able to access 4+ GB of memory in CS4. It's not clear if Adobe will release a 64-bit Mac OS version before CS5.