hi. just to mention it:
there was a while ago the discussion how to gain access to the directory usr/local/pd in OS X. another possibility is to show all hidden files using tinkertool http://www.versiontracker.com/dyn/moreinfo/macosx/11967 and then you may copy an alias of the pd folder to applications, afterwards you may hide the folders again, but your pd-alias in the applications is still there to have access.
m