It seems most people who talk about this on the net, claim that PS7 runs just fine on the Intel Mac and that it in fact runs, due to the Core Duo, on the latter faster than it does on a G5. What supposedly does not work is stuff like PS Elements, which doesn't matter to me at all.
PS7 has enough features for my purposes. I don't want to "upgrade" to something I don't need, although I could use an English language version of Illustrator, because the Japanese one is driving me nuts. Upgrading to CS3 Standard would cost $399, but to me it's just not worth it. That PS 7 is considered to have been rendered obsolete in regard to functionality, as many claim, is preposterous. I don't want to be unnecessarily milked by Adobe.
The reason I have no attempted to install PS7 on my Mac is that I'm afraid that something will go wrong. I'm currently backing up my 30 GB of files and then I'll try. Only one way to find out!