From what I've read on the mailing lists, the biarch port was stalled because they resolved to move in favour of a multiarch approach which would solve the problem in a cleaner way that should involve less breakage, and permit more than 3 ABIs on the one architecture. All this proposed for after the release of sarge, of course. See:
http://raw.no/debian/amd64-multiarch-3 (current multiarch proposal)
http://www.linuxbase.org/~taggart/multiarch.html (description of what the filesystem layout would look like)
http://lists.debian.org/debian-amd64/2004/07/msg00175.html (biarch vs multiarch)
http://lists.debian.org/debian-amd64/2004/05/msg00285.html (another succinct but informative thread about pure64/biarch/multiarch)
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