Being an intensive LaTeX user, I found that in an Windows environment,
TeX4ht is easier to use than Latex2HTML which was originally developed
as an Unix application.
In fact I generate all my webpages using TeX4ht.
(It takes time to sort out how to do it, I must admit, but so does Latex2html).
The package allows to generate not only html but also xhtml and xml.
So to obtain ePub format my preferred sequence would be to convert the
LaTeX text to xhtml and than to ePub.
However, with this last step I have no experience.
Suggestions?
Herman
PS.
For all these packages, see:
LaTeX:
http://www.tex.ac.uk/
TeX4ht:
http://www.cse.ohio-state.edu/~gurari/TeX4ht/mn.html