On Mac OS Snow Leopard (10.6.x) the "PDF Printer" functionality is not available any more.
When you install Acrobat 9 or CS4 from your media, it will happily add a "PDF Printer" to the list of printers, but (haha) it does not work any more.
Adobe blaims Apple for this, but it seems that the PDF printer way was kind of legacy any way - it just happened to be used by almost everyone.
According to that same article, there is a workaround, which is comprised of a new menu option "Save as Adobe PDF", in the drop down menu of the PDF button, on the printer dialog.
Unfortunately, when I installed Adobe Acrobat 9 or CS4 that option was not available.
I installed from DVD media, and those contain Acrobat 9.0.0. As soon as it is installed, Acrobat phones home to find out there is an update to 9.3.1 and goes downloading and installing - which is good in itself, because now you have at least a non-vulnerable version (well, ehm, not YET known to be vulnerable).
I installed 9.0.0, then manually downloaded the update to 9.1.0 and ran it. This added the much wanted "Save as Adobe PDF" menu item. From there on Acrobat will update itself to 9.3.1 again, but the option stays there.
Bottom line: the options ONLY seems to get installed when updating from 9.0.0 to 9.1.0.
Directly updating to latest/greatest will NOT work.
Pretty counter intuitive, but at least I know what to do now....