VIA isn't an alternative architecture, they make x86 compatibles..
As ocicat mentioned, the SPARC-based Tadpole systems might be worth playing with.. another option would be the Sharp Zaurus (ARM-based).
http://www.openbsd.org/sparc.html
http://www.openbsd.org/sparc64.html
http://www.openbsd.org/zaurus.html
You can find a picture of the Zaurus on the OpenBSD port page, as for the Tadpole, I'm not sure. (
But I think they're expensive..)