This blog has great tips about how to plan a trade show and how to ensure that all the participants in the show - attendees, sponsors and vendors have an equally great experience. Blog is written from the perspective of the event planner organizing the show.
Here's a trade show booth I built for Just Love Coffee Roasters. It goes together with locking latches and and be downsized for a smaller booth space and slightly different looks. The look can also be changed with different chalkboard art.