Yep, the latest beta is definately one to avoid, unless you like torturing yourself (only kidding!).
As for the dev lists, they are freely accessible without having to sign up at all, just follow the links Po has provided. But still, it is advisable to mail any bug reports etc (after reading the archives) to the dev lists, as this is where the developers pay attention. Sometimes they look at these forums in times of calm, however it's not all that often (which is why calls for development updates fall on deaf ears).
(smilyface), Andrew handles the documentation for K-Meleon, he doesn't update the homepage or anything, as he has his own website to manage.