I look for months for a ruby mud client or at least something that can
script in it and I come up dry.. a side-comment on mud engines
themselves generates huge interest.  =)

A mud engine which can support 500 people on a moderate setup whose
mechanics are a bit more complecated than the original
Rolemaster/spacemaster rpg.. no, I'm not going there just yet,
although it would be an interesting way to make my revised game
mechanics come to life.