Why knock on Adobe's door about this? What makes you think it's their problem? From all I've read here - and with considerable interest in case I decide to change my O/S - it would appear to me that this is an Apple Computer Inc. problem which they need to resolve. Now interestingly, Wayne Fox says they've recognized the issue and Jeff Schewe says a number of other issues have been addressed in a "dot" release or two of Snow Leopard, so perhaps from hereon it is just a matter of waiting for the printer target "no color management" issue to be resolved and all will be well?
I knocked on Apple's, Adobe's and Canon's doors. Apple initially refused to respond quoting "business reasons" but then gave me some limited information which I cannot reveal under a non-disclosure agreement (although, really, it doesn't help much). Canon have failed to respond at all, aside from a standard letter answering another entirely unrelated question. Adobe, however, have spent a considerable amount of time and effort - at a very senior level - trying to help me (us) out.
From the information Adobe have given me it does appear that the origin of the problem is from Apple. Adobe have told me that Apple changed the printing APIs such that every file sent to a printer "must" have a profile attached to it (i.e. it must be "tagged"). Thus, in the case of untagged files (our colour patch targets for profiling), the OS attempts to colour manage the file in undisclosed ways which is, of course, what we don't want it to do.
CS4 adopted these new Apple APIs, presumably in preparation for the release of Snow Leopard. Older versions of Photoshop still use the old APIs, thus no problem.
I do not believe that it is helpful to hand-out blame to one party or another. My own view is that Apple, Adobe, and the printer manufacturers should all get together and solve this problem and stop 'handing it over the wall' to someone else. They all need to take responsibility for the problem and for finding a solution. It is not as if it is going to go away of its own accord !