Well, beyond ENZ, I browse
TelemarkTalk,
Vorb,
LandSARForum,
Velonews,
MTB-Buddies and
CrazyGuyOnABike (all real and all favourites), but not sure to what purpose you asked? The most it tells you is that I appear to enjoy activities involving strenuous activity on bikes, telemark skis or taking helicopters into remote places to bash around for lost people. Based on the intersection of our lists, we're quite different and have nothing to communicate about ;-)
In actually, I'm in IT and do read some of your sites, but my work resources don't rank highly on my "like" lists.. However, I almost never post on technical sites.
It might be more helpful to ask what people like to do (for work or hobbies) and where they get their information about related resources, activities and participants... I suspect you'll get a better response rate and more useful info.