Sent a PM to those not on the list. If they fail to respond within 2 days, I'll put them in the inactive section.
EDIT: PMed OK9ZERA, stolenonyx, watashime, Yinbot.
If, after being in the inactive section for two weeks, they don't show signs of life, they'll be kicked out. (I'm pretty sure they would be let back in by me, though. ;) )