If you want your public speaking handout material to be kept forever, you must give each audience member a reason to keep it. I do this by strategically adding important reference material to EACH PAGE of the speaking handout. This material was picked specifically for that day's audience.
The reference items could be important phone numbers, web site addresses, book titles, or even humor that applies to the audience*s industry. The reason the information isn't put on one page at the back of the handout is because that page could be torn off and the rest of the handout thrown away. Don't forget to put your contact information on every page of the handout too.