Many thanks to Hubert Feyrer, the image is now available at

 ftp://ftp.netbsd.org/pub/NetBSD/arch/cobalt/restore-cd/

Known Problems:
---------------

 * Marek Gaffke reported that the installation does not work on his box. We
   are trying to figure out what's going wrong on his machine. So far it
   /seems/ that the installation script misconfigures partition table and/or
   disklabel on big hard drives (20Gigs in this case).

Thanks for trying this!

SY,
--cdi