diskusjon.no still seems fairly active. Though anytime I search for something non-tech-related in Norwegian ("us taxes norway", "car brake trombone", "kid face blue", "beach meteorite"), I typically get one of the forums Kvinneguiden.no ("the women's guide"), BarniMagen.no ("child in tummy") or MammaNett (… you get the drift). So there's a part of the Norwegian Internet that strangely hasn't been swallowed up by the FRAANG.