Hey Robert
Any chance you could drop by Seattle over Easter Weekend? NorWesCon is a large regional SF convention (lots of people who READ), and we've had many previous panels/events on the subject of electronic books and reading. We'll likely get lots of Sony and Amazon hardware around, but smaller vendors won't be there. If you could bring some of your samples along, I bet you'd draw some interest. Hardware to handle is always popular.
This year's Guest of Honor is R.A. Salvatore, and the Spotlight Publisher is Wizards of the Coast. They'd love you even more if you could display some of his books. The Con website has an early version of the schedule, if you need to limit your time.
http://www.norwescon.org/eventschedule.htm