The following are some good examples of posters that have additional
"hardware" elements pasted on them.
Click on the images for a larger version.
The slide includes a folder with a copies of it, and an area for adding
comments.
(ICSE 2006)
Another approach for collecting comments: a notepad and a pen hanging on
a pin
(ICSE 2006)
This slide has copies and business cards attached to a paper fastener.
(ICSE 2006)
This slide includes a blank area where a projector shows a demo of the software.
(ICSE 2008)