I received http://von-wachter.de/dateien/for-biblatex-1-6/biblatex.4ht on 14.11.2011 from Radhakrishnan.
Fair enough :). It is not yet at http://svn.gnu.org.ua/viewvc/tex4ht/trunk/texmf/tex/generic/tex4ht/biblatex.4ht Yes, so this is what I was remembering ... I was waiting for CVR's confirmation/commit. I hope it was all right to put in on the web. It works with biblatex 1.6. It seems that what we really need is a biblatex.4ht that works with biblatex 1.7, since that is what is in TL, and (as noted) it is hardly trivial or desirable to downgrade. I could easily be missing it, but I'm not seeing no specific bug report regarding biblatex 1.7, just your report of failure. Can you construct the usual small test case / expected output vs. actual output / etc. so CVR (or anyone :) has a chance of doing that? Thanks, k