The always useful PubRants blog by Denver agent Kristin Nelson has some particularly useful advice on why agent-rating services aren't necessarily what they're advertised as.

Kristin is a faithful blogger and her site is always of interest if you're trying to get published. I already have an agent, and she's hard at work marketing my work, but I still follow Kristin's blog because she has so much info on how things work in the publishing biz. Like a lot of writers, I have a link to Kristin's PubRants blog under my links section.

Knowledge is a good thing.