Article: Pitch Lines, Website: querytracker.net

[gillian]

The pitch needs to convey three things: the plot, the genre and the tone of the story. And it needs to convey these things in one concise sentence. It doesn’t need dialogue, it doesn’t need a cast list, it doesn’t necessarily need the title and it definitely doesn’t need the word count—and before you snicker at this advice, you should know that these are common mistakes. And they’re not the only ones.

Link

Website Rec:

QueryTracker.net

Provides:

List of top literary agents

• Tools to keep your queries organized
• Benefit from the collective knowledge of thousands of other writers, all of which are enduring the query process just like you.
• Export and backup your data at any time
• The data compiled on agents and queries will give you special insight, such as:
        The number of queries sent to each agent.
        The number of queries each agent accepts.
        The number of queries each agent rejects.
        Response times of agents.
• Plus much more...

This a free website that's basically a database of agents.  It shows an agent's acceptance rates of manuscripts, the number of queries sent to each agent etc.