I am relatively late to the D100 party, but I love it, and now there is no going back. I have run a number of sessions for my game group, all using Legend.
I am not really much of a fan of historical Earth Settings and would actually prefer a Vanilla Fantasy setting for me to steal ideas that I like from. I'd love to see more generic fantasy material, in general, especially stuff I can compare my own material to. When I create cults, as an example I feel lost when comparing these to the incredibly detailed Gloranthan cults.
As mentioned, however, I wouldn't want another D100 rule system, I would recommend using Legend and its OGL.