The version of python I used was compiled from most recent code release, and I was using mod_wsgi pre-compiled from debian 6 default repository, removing it and compiling my own mod_wsgi with most recent version was enough to fix the problem. I think that means they where not compatible.
Since pip install html
/easy_install html
didn't work, symlinking /usr/local/python3.3/html
to the virtualenv site-packages folder made the interpreter read it as a package.
This may not be the greatest solution, but I'll make it the correct answer until a better option comes.