By: Steve

I agree. You should have a good understanding of what you are trying to promote, who is attending, and how best to tie in the two with a keepsake they will keep around in the office and not just hand off to their kids to destroy.
In my opinion, the best bet is to give away something that belongs in the office or on a desk. This way it has a better chance of landing in a place where you logo is near where they make their business decisions.