After a trade show, I usually get a flurry of emails from exhibitors. In many cases, I don't remember the name of the company or what triggered my interest.
David Condello, Commercial Accounts Representative, Ceilume Ceiling Tiles has a technique to trigger the memory of visitors to his booth; he puts a photo of the booth at the top of his email. For visual thinkers, like many designers and builders, this communicates more than the proverbial thousand words.
He also writes a great letter and sprinkles it with other photos. And most amazingly, he sends the emails just two days after the show.