You have a limited amount of time to pitch your book. You need to make use of every second.
One Liners: Also helpful in speed pitches, but get a good one line pitch in case you need to fire it off in the hallway or for some reason you're running out of time (don't pitch in the bathroom, the answer will be NO). One liners can consist of comparisons to books and movies, but no matter what it needs to get to the heart of your story, be unique, and be memorable.
The delivery: Don't read from paper. You should know your story well enough to give us the key points. (We do understand if you have to read from paper, but you'll come across stronger and more confident if you can do without). Eye contact. Speak up. It's usually very loud in speed pitching rooms. Make yourself heard (but don't shout).
Etc: Be prepared for whatever the agent might ask you including but not limited to: Who will this appeal to? Where will it sit on the shelf? What makes it unique? What writing experience do you have?
Giving us business cards isn't necessary and don't give us pieces of paper or anything else. We are either interested or we are not. And we'll be asking you to contact us with the asked-for materials. We have no need for your other material.
We're here to help. Make use of all your time. If you have a little extra time in your pitch session, ask us some questions. We'll happily give you advice on your pitch, other people you should contact/pitch, what you can do to fluff your bio.
Most importantly, be confident, have faith in your work, and convey your excitement. And have fun! We are just people, not scary at all. We want you to succeed.