I love Polyhedron's minigames. Every one of 'em. The problem with them is, as many have pointed out, that they receive no support. So, I have a suggestion...
Make 'em OGC. Let companies and fans play with 'em. See what ones garner the most interest, then publish some support for those that are the most popular.
The reason I love the minigames is because of how they cover so many genres that haven't been covered yet. I mean, Thunderball Rally (Or whatever it was called; I don't feel like dragging the mag out right now) covered a genre that isn't often covered (other than by Car Wars), and seems fun, to boot. The same is true of the rest of the minigames - WWII, Scooby-Doo-type cartoon mysteries, John Carter-esque adventures - that stuff can't be beat. Iron Lords of Jupiter is a good case in point - man, I'd love to see a more thorough treatment of this setting. And it's not the only one I feel that way about.
The minigames help show that d20 can be used for a wide variety of genres. Trouble is, being closed content makes them a creative cul-de-sac. No real support for them is planned by the parent company, and nobody else can use them, so a lot of good ideas fall by the wayside.
Regarding the comments above about genres becoming scarce or too narrowly-defined - I have to disagree. In fact, I think that's why the minigames shine - they cover very narrow genres, or genres that often seem wacky or simply bizarre. Why not a King Arthur minigame? An 80s slasher-movie minigame? Or minigames based on classic literature? Doc Smith space opera? Time travel? Soap operas? Sitcoms? Storm chasers? The point being, experiment with d20 in genres it hasn't covered, or with genres that haven't been touched by RPGs before, even if they seem, well, stupid. So far, many of those that people decry on the internet are the ones I think are the best.
As for other suggestions for the magazine - I'd say lose the glossy paper. Simple white paper is best for adventures, because many would like to write notes or revisions on the adventure. Glossy paper with colorful backgrounds makes that tough to do.