This always perpexled me. Was someone really hurting to play an aasimar devotee of Pelor in a modern-day setting? And did they really need a setting hardcover for it, when all the D&D stuff was already very portable? Talk about a failure of imagination.Then came Urban Arcana... one of the worst setting books in the history of bad setting books. It created Greyhawk: 1999, and it really didn't have any pizazz behind it beyond simple stuff (oh my gods! Imagine a BURGER KING WHERE EVERYONE IS SHADOWKIND!!?!?!)
I played d20 Modern a bit and didn't care for it. I don't think that the core d20 system, with levels and abstract hit points and AC, models modern genres very well. What you basically get is D&D with guns. Plus the wealth system is extremely clunky.