Last I checked, the deal with the duo 230 is as follows:

- it works

- out of the dock (and in the dock if your dock has no FPU), it's SLOW 
because it has no
	FPU.  This especially true because it has to run  FPU emulation code

- the internal hard drive could be a limiting factor (if it's 120megs, 
you can do "ok" but it's still
	pretty tight for a robust install)

- I could not get the internal modem, serial ports or external hard 
drive to work
	with my mini-dock.  This may have changed and/or may be different 
with the full dock.

- I had no problems running serial PPP with it out of the dock (even 
went as far as to do arp
	on the PPP machine so I could telnet directly in to the duo)

- you need a special kernel, although at this point, I believe all of 
the kernel mods have been
	included in the GENERIC kernel, although I could be wrong

These answers are OLD (1.2.1 -> 1.3) and things are likely to have 
changed quite a bit,
but it's a start.  Suffice it to say that NetBSD does run on a Duo and 
works pretty well
if you can get over the disk limitation and connectivity limitations.  
Having just acquired a
doc (but not having had time to play with it), i'm very curious as to 
how things will work
with 1.5 and the Duo and how quick my duo will be docked (given that 
there's an FPU!!! Woo!).

If anyone else has updates or pointers regarding anything I've said, 
please CC me
as I'm very curious.

	-t