Hm... it sounds like a good idea at first, but then I think about what I do with pamphlets like that. I look at them, but then they get either thrown away or filed away, and I forget about them. A better idea - have a sign up sheet for a monthly newsletter and encourage those who stop at your booth to sign up. That way each month they'll get a newsletter in their email showing your products, news, etc. to keep you fresh in their minds! Plus you can save the printing costs ;)