Because d20 Past was such a crushing disappointment, I've been working on my own rules for a d20 "past" game: right now I'm wavering between a California Viejo game (swashbuckling adventure in the time of the padres and dons, a la El Zorro), or a Great Game game (intrigue between the Russian and British agents in Central Asia) in the 1870s.
There's also the Darkest Africa game (exploration in the vein of Source of the Nile) I'm running for my tabletop group right now using Mutants and Masterminds - I originally started working on this for Modern, but because I don't care for Vancian magic and I didn't want to adapt the d20 CoC magic at the time, I went with M&M. Many of the AdCs and feats went from the Africa game to the Asia game - it wouldn't be hard to adapt them once again.
It might take me a month or so, as I'm a bit busy at the moment, but I might be able to get one of these up and running on the boards, if there's interest.