If you're interested in great Web sites for writers, check this one out:

Agent Research
agentresearch.com/agent_ver.html
Agent Research seeks to match writers with the right literary agent based on the writer's stage of career. The Agent Research staff communicates with writers to produce an in-depth report that lists who's selling what you're writing and how well they're doing it. The site works only with legitimate agents who charge no upfront fees. They work based on the principle that "if a writer's work is publishable, the writer can get a real agent." The reports have various costs, but agent verification is free.