I added a section to the docs on how to do HTML based email from acs-mail-lite. It does require the fix that Janine points out here (which is quite an easy fix).
I'm uncovered a bug in acs-mail-lite's rollout support, however, something I introduced (or at least didn't address when I added in rollout support). ns_sendmail doesn't handle the extra_headers the same, so it bombs out when trying to send MIME email when you have rollout support enabled.
