Updated link: Per Moonie, Preditors & Editors has a new link. It was in her excellent post about agents yesterday -- and how they do not charge you until you yourself get paid on a contract. That's the mark of a legit agent every time. Anyone else is a scammer.
Which maybe you already knew, but in case not, I thought I'd say it again. That's "a percentage of your earnings" as Moonie says. Not a reading fee, or anything else of that nature.
Also... here's a heap, or rather a series, from Charlie Stross -- the common misconceptions about publishing. Which I got from the discussion Scalzi's having about why "punishing" publishers doesn't work; this is still about Amazonfail, of course, and Kindles.
Jeremy brings up his thoughts on author research...