well,
i'll try to answer as far as i can due to my little openbsd experience on my c3000 people will correct me when i'm wrong
>1. Do the original OpenBSD packages need to be recompiled in order to be used on >Z?
no they do not if you do not want speed optimization
from iamasmith there
https://www.oesf.org/forums/index.php?showtopic=17871"On OpenBSD default build uses no xscale optimisation for the bulk of the executables - The Kernel is compiled with -mcpu=xscale but the rest of the distribution is compiled (for compatibility with other ARM architectures) with no optimisations. - It is possible to set some environment variables prior to build that will enable xscale optimisations and you get much better performance when you do this."
>2. Is the SD driver fully functional now (for storage, not for booting)?
not yet apparently :
https://www.oesf.org/forums/index.php?showtopic=23517>5. How is wifi CF and bluetooth support?
my cf wifi card is working out of the box
bluetooth is not yet fully implemented (that's the main reason i do not yet use openbsd on my zaurus
>8. Is it easy to do native compilation on Z?
definitely yes, at least for ports
have a look here
http://www.planetofidiots.com/zaurus/>10. (How) Can I dual boot OpenBSD and pdaX?
i read that it is not (yet) possible
hth
JP