.afpDeleted* files, who's making them?
In the 2004 words of Leland Wallace, an Apple employee in the Core Servers group:


  There is a unix programming "pattern" of creating a temp file, opening
  it, then deleting it, keeping it open. This allows the application to
  have a private scratch file that cannot be accessed by any other
  process (the file will to be completely deleted when it is closed).
  AFP does not have direct support for "open-delete" so we need to fake
  it by renaming the "deleted" file to .afpDeletedXXX and deferring the
  delete until it is closed.


Source: http://lists.apple.com/archives/macos-x-server/2004/Jun/msg01271.html