www.organicbebe.com is a starting place. however, don't be put off by the small selection of diapers. their registry is run by www.felicite.com and you can add items from any website. you don't even need to go through organicbebe, you can go straight to felicite.com. that way you can handpick your registry with a GOOD sling, car seat, diapers, natural soaps, whatever! have fun.
I also think a lot of WAHMs do registries through different business. I finally got around to setting up my own registry for customers instead of just giving a bunch of money to some business that I don't know anything about. Some of the registry fees are pretty steep for the WAHM. Maybe some WAHM should start one. Any takers?