I am also interested. My current plan involves writing random things in a notebook, and then ignoring it when the time comes to make decisions. It works surprisingly well.

What type of game are you talking about here? Design specs tend to be pretty game genre specific.

Well, we'd want something simple enough to read quickly...something just to see what they look like, really. A simple puzzle game should probably be sufficient. That is, if you are considering providing an example.

Otherwise, what sort of things woudl you need to include? Since you say it's genre-specific, that implies that systems and features common to the genre wouldn't be fleshed out in detail in the design specs.