Although the name initially quite seriously turned me off, for completely unrelated reasons, I finally got around to checking out my friend Kirin's Creative Commons uber-short game Old School Hack. And guess what? I found it quite good. I also checked out my other friend Corey's adaptation of OSH to his Dino-Pirates which is actually a closer analog to anything I'd be interested in doing with DARK•HERITAGE than the original OSH is.
Still, go check out Old School Hack, Dino-Pirates Hack, or even the original Red Box Hack for an interesting take on a rules-lite approach to gaming with a focus on being fun and kinda crazy.