Frazzle,
I have found Trade Shows to be highly effective for some people and no gain at all for others.
Some of the things that I see as necessary to make a trade show effective ISN"T how expensive and elaborate the display.
Do attend an appropriate trade show for your product.
Do have a sign with your company name and if your company name does not immediately let the attendee know what type of business you are in, have another sign that large enough and visible from a few feet away as to what you do. For example: Your company name is Sanders Institute. That is great. What does it do. Have another sign that says what you do in every day english not in the jargon of your industry and from a WIIFM (what;s in it for me) format. Say it is Sales Training, don't say that, instead say something like the benefit to the customer "Average Increase for your Sales Force of 50%" . Of course make sure it is a true statement.
Have plenty of brochure on hand but not all out at once. Anything scarce is valuable. If you have tons of them sitting all over or you hand them to everyone, they will most likely end up in the trash and on the floor.
Be up and active. I've been to many trade shows where the people are just sitting back behind the table talking to each other waiting for people to walk up to them. Be up, make eye contact, look happy.
Absolutely have a drawing, even if it is just blank paper and you ask them to write their name, address, email and phone number. BUT make sure the drawing is for something your provide so that you actually are getting leads not just people who want something for free. And make sure the gift is valuable and not just something you do all the time, like a free consultation if you always do that.
Also, have, in addition to the drawing, a sign up form for people who want more information via phone and email. Many people may be interested but don't want a long sales pitch right now.
Dress, talk and act professional for your industry.
And as a final note. I have had businesses myself and have consulted businesses, that our entire basis of new clients was only 2 trade shows a year. So, follow up on the drawing names and sign ups, immediately after the show and then every few months and if they are not interested, get their permission to check back with them in a few months again.
Good Luck.