ascii.com - File Conversion Software
Includes a word2html product that might be worth a spin (demo avail, ~$170 single seat)
Terry Morse’s Myrmidon
I keep running into and it still looks like one of the best tools out there. Mac-based, installs as a print driver, so you can convert to html from any application that has a print function. Need to check it out against some sample Word docs, but the setup options and a quick test against a simpletext doc look promising. Still wouldn’t hurt to push that output through Tidy or similar, but it looks clean.
And it’s apparently now free. My kind of price…