[Orgmode] Limited #+INCLUDE ?

[Giles Chamberlin]

I've been using org-mode for some course work: "write an essay about
your software including the interesting bits, add all source code in an
appendix".

#+INCLUDE solves the inclusion of source code files very nicely - I'm 
guaranteed that my document includes the latest versions, type set as I
wish.

Unfortunately at the moment I'm cutting and pasting the snippets of
"interesting" code into the body of the essay.  What I'd like to do is
be able to label interesting regions of code in the source file and then
import the labelled blocks into my essay. Is there a way of doing this?

-- 
Giles