Last week I gave a workshop about game development using Gosu at my university. It went pretty well, about fifty people came and the overall results were very good. It was a two-part workshop, the first part was about Gosu's basics (Window, Image, Font and events), and then we worked on an small arkanoid (conveniently called gosunoid).
You can find all the materials in the official repository
. In particular, you can download the workshop materials here
(there's a project for MSVC 2008 Express and Linux) and the presentation is uploaded here
(although it's in spanish).
You can see a couple of photographs of the workshop too
It maybe useful for anyone looking for ideas to make a workshop like this.