I'm a fan of the agent WOW kit. I wrote about it here: http://more.showfax.com/columns/avoice/archives/001334.html

Of course, this assumes you've already done your homework, you know this is an agent you'd love to sign with, you're the right type for a hole in his roster, you know he has access to the casting offices your type is made to visit... all is good. :)

And that WOW kit is just a backup to what's going to happen in the meeting: You're going to show off who you are, you're going to show them who you can be in the room when they get you out, you have a monologue handy should they ask for one, you are ready to improvise or cold read if you're asked to do so. All is well. :)

Go get 'em! :)