I thought I would come over here to announce that I've just recently added Vavoom support to
Doomseeker. I've just released a testing build of the still in development Doomseeker 0.5b which contains the Vavoom plugin
here if anyone wants to give it a try.
Does Vavoom have an established master server yet? Though in any case this plugin means individual servers can be queried through the custom servers function.