Fellow speaker,
World Champion Speaker Darren LaCroix suggests using the "Audio Postcard" for promoting your presentations. Using this postcard allows you to set up a better audience by giving them a "what's in it for me" talk before your presentation. It also gives you residual income if you recommend it to others. Can create the talk on CD or phone it in. Search on the web for "Xiosoft Audio" to find out more.
Hearing,
Tim Wilson
Professional Speech Coach
Free speaking tips at http://speakingquicktips.blogspot.com