I've been recommending this link to a number of my clients who are getting ready to go in search of an agent, and I thought I'd post it for the rest of you who might be heading that direction.
Jamie Ford, in case you haven't heard of him (and apparently there are folks who haven't heard of Kafka, so Jamie doesn't need to feel bad and I'm sure he doesn't) is a best-selling author. His first novel, Hotel on the Corner of Bitter and Sweet, has met with all kinds of success. Check it out.
Jamie is also a generous blogger, and one of the things he blogged about was his process of finding an agent. He even quotes his rejection letters (and no, he is neither spiteful or sassy, as he might be under the current circumstances; he's just humble and professional). He approached the process very well, and he gives some good tips about it. Plus it makes for a good read-suspense and a happy ending.
You can probably troll his archives and find lots of great material. I'd recommend starting with his entry on the Query-Go-Round, and follow through, being sure to stop at I've Made Up My Mind, until you see his final announcement. Then of course, you can follow him as he becomes a best-selling novelist. All good fun.
Don't forget to get back to your own writing, though. Because the number one way to get a great agent is to write an irresistible manuscript, oui?