I've decided to use Mantis Bugtracker as the bugtracking tool for libhttpd. This is the tool I already was using before placing it on sourceforge. And I've got pretty good experience with it.
There's one problem, I would like to make others post bug reports directly into Mantis. The problem is that Mantis doesn't have a Captcha plugin for submitting bug reports.
For the time being It's not allowed to sent bugreports directly without registering.
You can find the bugtracker (currently empty) at http://bugs.gamecreatures.com/