flyer would be better than poster, but I always just go to the web site and look there as any printed material gets misplaced.
anything that would hang around, be used and not be relegated to the storage bin (big brown box full of all the misc paperwork or the trash can) is always a plus. On the other hand, most of us here know about your products. If you are targeting ppl that are not familiar with it, I think a trifold or something like it with a Postit pad would be a good idea. Have them (post it notes) custom cut in a shape of a platen and send out with the brochure. It'll cost less than a poster and stay on the desk longer.
sorry, that's the best I can come up with. . .
pierre