PD-Mac folks,
Some of you might be interested in launching PD files from the finder. Although it's not quite as easy as a double-click, I recently found a contextual menu plugin that is fairly usable (and configurable). OnMyCommand, with its companion OCMEdit is a nice bit of freeware to allow this: http://free.abracode.com/cmworkshop/on_my_command.html
It should be easy enough to understand, but if you have any questions, I'd be happy to field them off-list.
best, adam