For watching this video, we put up a simple thumbnail grid to the left of the screen, printing out each of the slides and taping it to the wall. The grid was lit up by the projector, which made it stand out in an interesting way.
The black vertical bar is the playhead, which moves along as the video plays, and can be controlled with the laser to jump around in the video. The video spends a different amount of time on each slide, so the playhead moves at different rates through the different slides. I thought this worked well, and the speed of the playhead gave a subtle hint of how long the current slide would be.
The red bars are bookmarks. At any time while watching, a viewer could laser the screen, and it would leave a bookmark at the current position, to remind the viewer of a point that they wanted to bring up during the discussion afterwards. I liked that the act of bookmarking was visible to everyone, as opposed to simply typing a note on your personal laptop -- it felt useful and important to know that somebody found something noteworthy in what was just said.
Glen collected and printed the slide screenshots, Robert put them up, and I made them laserable.
Video of playhead moving: [IMG_8376.m4v]