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I am currently working on an expanded zipfile module that:
(a) Has a more easily extensible class
(b) Allows BZIP2 compression (my orginal need)
(c) Allows file-like (read) access to the elements of ZipFile
(d) Provides for a single "writer" which can be used to 
     generate file contents "incrementally" while possibly
     reading from other "files" in the zipfile
(e) Allows the opening of embedded zips "in-place"

What I don't have at the moment is a good set of tests
or good documents of how to use it.  Anyone interested 
in collaborating, let me know.

--Scott David Daniels