I had seen the patch when I was surfing around for info, but I wasn't sure if this was what was I looking for.
with the patched version you can simply run latex2html texfile, then all jpg images are unchanged or with the image_type option other formats are converted to jpg.
You'll find it here
http://www.perce.de/LaTeX/misc/l2h_jpg.tgz it includes the patched source and a precompiled Linux version
Herbert