Since my latest project is a humor novel I believe that I will have to find an agent. The usual web sites are:
Preditors & Editors http://anotherealm.com/prededitors/
AgentQuery http://www.agentquery.com/
Absolute Write http://www.absolutewrite.com/
Some agents have blogs and I've found them useful and entertaining.
http://misssnark.blogspot.com/
http://crapometer.blogspot.com/
http://raleva31.livejournal.com/
http://www.nathanbransford.blogspot.com/
The Miss Snark site lists a few blog sites of other agents and editors.
Dave K