Where are all the Agents?
Before you even think about submitting anything you MUST read their submission requirements first. It’s understandable, their inboxes are brimming with new submissions and requests, so if you want to get seen make sure you follow the rules first. Don’t give them any reason to send it to the trash even if that means checking the spelling for the umpteenth time!
Start here and see what the agents are looking for!
Manuscript Wish List
Jonathan Dalar keeps a nice list of agencies located both in the US and the UK. He also includes a lot of specific information about agents and genres that can be quite useful.
Grad Student Freelancers Blog - weekly lists of agents looking for clients and other opportunities.