UPDATE: offroadgeek has created the forum. Go check it out!
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I'm sure there must be some BSD fans here!
The OpenBSD has a full port (arm port) working and stable (so I hear) for the C3XXX series and are working on the other recent zaurus models (C760/860/1000).
www.openbsd.org/zaurus.htmlThere really ought to be a ROM forum for OpenBSD. The openbsd arm port mailing list is pretty dead.
-Daniel
PS. Supposedly it's a piece of cake to dual boot OpenBSD on your Z...