What MUDs Do You Play?

RotW Inc asks: "Well now that we've asked the question about what free clients to find for 'mudding', lets start asking the readers which MUDs they prefer? I've been playing Arcane Nites for many years, and recently they've gone under an entire coding change (exp per hit, spheres that contain skills anyone can practice, a hiding/sight % system, ranged fighting, and that's just a taste) and I'd like to compare that to the favorites of others out there."