I ran a BR game in 3.0 and converted to 3.5 near the end; it was heavily inspired by Elizabeth Willey's "A Well-Favored Man," "A Sorcerer & a Gentleman" and "Price of Blood & Honour" trilogy about Argylle and the very Amberite-like families of nobles who governed it. I created my own map, used my own NPCs and places, all stolen from Willey's books, but used many of the BR concepts such as bloodlines, awnsheighlien, elves, dwarves, Regency Points (which I also used as a kind of action points), etc.
It was truly awesome and a lot of fun. Retired it almost at the point where the current gods (including Cuireacen, et al) were about to have their big showdown with the restored Azrai. The idea was for the PCs to become the new gods, but I never got that far.
Cheers,
Cam