> 	As the subject says, has anybody installed NetBSD-m68k 
> 	successfully on a 630 ?

Last I heard, someone was trying to, but I don't think he's
so successful with it so far.

> 	BTW, the Linux on Mach (which version of Mach ?) sounds
> 	interesting as we also have a PoweMac 7100, does anybody 
> 	have some approximate release date ...

It is a project by Appl and OSF, so you've got a wrong place to ask.
See http://www.mklinux.apple.com/.

ken