
Send a query letter via regular mail or e-mail, but not as part of a mass mailing. Response time: four to five weeks.
The quickest way to get a response is to indicate "Exclusive query" in the Subject line.
Links:
[1] http://www.icmtalent.com
[2] mailto:lbankoff@icmtalent.com
[3] http://www.pw.org/literary_agents