Oh, I just thought of another category:
Most Likely to Go on an Unannounced Hiatus, Show Up and Post One or Two Random Threads, and Disappear for Another Few Months.
Nominees:
JoshuaG
4HG
Reddgirl
Recee
That mortician-student chick that always drives T-Block crazy... can't think of her name right now.
The Corrections Officer chick (can't think of her name, either)