I made a quick update to PEP 11, "Removing support for little used platforms". I added details about ending support for AtheOS/Syllable and BeOS.
I also added a yet-to-be-fleshed out section entitled "Platform Maintainers". I intend that to the extent possible we document the responsible parties for various platforms. Obviously, common platforms like Windows, Mac OS X, Linux and common Unix platforms (Solaris, *BSD, what else?) will continue to be supported by the core Python developer community, but lesser platforms should have one or more champions, and we should be able to get ahold of them to determine their continued interest in supporting Python on their platform(s). If you are the "owner" of a minor platform, please drop me a note. Ones I'm aware of that probably need specialized support outside the core Python developers include:
IRIX Tru64 (aka OSF/1 and other names (what else?)) OS2/EMX (Andrew MacIntyre?) Cygwin MinGW HP-UX AIX Solaris < version 8 SCO Unixware
IRIX and Tru64 are likely to go the way of the dodo if someone doesn't step up soon to offer support. I don't expect the others to disappear soon, but they tend to need more specialized support, especially in more "challenging" areas (shared library support, threading, etc).
If you maintain the platform-specific aspects for any of these platforms, please let me know. If you aren't that person but know who is, please pass this note along to them. If I've missed any other platforms (I know I must have have missed something), let me know that as well.