If I was teaching a class on RPG design, a one page game would be a required assignment. It really encourages economy of description and ease of mechanics.
Furthermore, it brings up an interesting question about layout. Given the limited space - how important is orginization? On one hand, since there is very little to go thrugh, just cramming as much as you can on the page seems to be an acceptable soloution. Then again - since you have so little to present, it must be as clear as possible since you don't have chapters or much space to expand upon. Both styles seem to be present in the contest.
Days of Plunder uses my more or lesss standard layout, and manages to be mostly normal 12 point font. (The optional rules are 10.5) Sputnik Lost is a bit odd, since I was trying to replicate a government document, so itsdeliberatly in all monospaced courior font. (Government standard untill a few years ago.) Still, I didn't mind using plenty of line breaks and bold to set it apart.