Therese Walsh sent me a brilliant book, and it arrived today!
2010 Guide to Literary Agents tells where and how to find the right agent. It also includes a free one-year online subscription. I'm looking forward to trying it.
This very useful book contains many entertaining and informative articles on choosing agents, writing queries and synopses, editing, contract points, promoting, and my favorite: Leaping Into the Fray: A Writer's First Year with an Agent and Editor, by Therese Walsh.
Now I'm going to go through the rest of the book and choose the agents I'd like to query - out of a list of over 550!
Thank you, Therese!