I want to keep the conversation going here. The following people (not counting insanolord & Khush) in my mind should be seriously looked into:
Stogi - Has stayed inactive in the game, only to show up today, only doing so to post without any substance. In my limited experience, Stogi has typically been sparse in posting, but never to this degree, and he usually will at least make a vote. I find it suspicious he hasn't voted at all, but why should he? No one is questioning him, so why would he bother sticking his neck out in public to be under suspicion.
Spak-Spang - if Khush ends up being Mafia, Spak's consistently verbal defense of him puts into high suspect.
Glad0s - Has had very limited posting, and only votes when it seems there's a fairly unanimous vote in place. Like Stogi, since no-one is paying attention to him, has had no reason to be involved in the game further.
This is getting ridiculous. The vote for the first few days have been "should we or should we not axe Khush" instead of looking for actual suspicious activity. Townies are going to get slaughtered if we don't get our act together.