TeX4ht (the 8/3/06 version in MikTeX 2.5) fails to
create an acceptable html file when used with hyperref.
Bibliographic references generate the error message
"Missing \endcsname inserted".
This is a bug in TeX4ht and has been reported and
for a discussion.)
I have verified that if the files in the directory
tex\generic\tex4ht are replaced with the current
version available at
then this bug goes away.