I don’t know much about this, except that it seems generally well-regarded, and it might satisfy Russell as a 3e-like system without all the cruft. I’ve read the Microlite74 rules, which take this and trim it down still further to make it more like a 0e retro-clone, and they seem pretty solid, though you still need a copy of some version of the SRD, 3e or the like for things like equipment lists and magic items.
Microlite20 is a minimalist role-playing game designed to be usable with the majority of d20 supplements, rules and adventures with little or no advance preparation. The rules for character generation, combat, magic and level advancement take up a single sheet of paper, meaning it is perfect for introducing role-playing to new players, gaming one-shot adventures or tailoring into your own game system. Downloads PDF editions of the rules, supplements, adventures, including pocketbook editions.