Attached is a patch to allow one to specify that results from executing a block should go to a specific buffer.

When a :buffer is specified, output goes to that buffer, which is erased first, e.g.:

  #+begin_src sh :results buffer :buffer *foo*
  echo foo
  #+end_src

When no :buffer is specified, buffer *org results* is used, e.g.:

  #+begin_src sh :results buffer
  echo foo
  #+end_src