Certain posters are so damn insightful and/or funny that virtually every post is a gem. My personal favorites are:
Libertarian – brevity is the soul of wit
Elucidator – truth in a nom de plume
Stoid – liberal minus the bleeding heart
Scylla – consistently funny and twisted (he’s also a Republican, but no one’s perfect)
Chronos – the physics tutor I always needed
Guinastasia – has yet to say anything I didn’t find entirely sensible
These were the first to come to me, but there are lots more I love to read.