Mike, If you are referring to OpenBSD, it already runs on the amd64, though
with memory limitations. You would know this if you read the openbsd.org
web site. GNOBSD is *not* OpenBSD--it is based on it, but it is a separate
project. I don't know much about it, but it isn't OpenBSD.
You don't need an installer written. The one that comes with OpenBSD is
extremely easy to use. It's a myth that graphical programs are better than
text based. Intelligent design beats pretty fluffy pictures any day.
--STeve Andre'