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Martin:
- Have you actually seen a recursive import of zlib? I don't
see how it's possible to cause a stackoverflow. Hm, maybe if
someone stuffs a zlib.py in a zip archive? I'll add a guard.
- Are you really saying it *should* be a builtin module, or
was that comment supposed to start with "if"? See also
Paul's remark about zlib: if zlib remains a shared lib,
having zipimport as a builtin only helps for non-compressed
archives.
- gc: I'll give this a go (never done it before!)
- get_long() -> it's called with a signed char *, and the
buf[i] & 0xff should take care of the rest, so I'm not sure
I understand. But trust your judgement and changed it in my
working copy.

Thank you very much for the quick reply!