Practicing your presentation helps. With a recording device or a test audience, you can get valuable feedback concerning the style and timing of your presnetationpresentation, among other things.
In addition to verbally presenting a paper, there is supplementing the presentation.
Sometimes the interested audience member will want more. You might prepare ahead of time some business cards, or even slips of paper, to hand out. They should contain your contact information, the title and time of your talk, and optionally a URL to a file that contains details of your presentation that you would like to have given. This is one of the things I will do for my 15 minute presentation. If you are really on top of things, you could have something ready to receive the member's contact information as well.
Gerhard "Ask Me About System Design" Paseman, 2010.06.28