Jon Winter has a much better PSFAQ here.

Alex's FAQs:

NEW: Do the Celestials fight their own Blood War?

NEW: What do you get when you cross a tiefling with an aasimar? An archon with a genasi?

UPDATED: What other names are there for the planes and places in Planescape?

What other names are given to the people and races of the planes?

How do you pronounce these outlandish names then?

What's an overpower and who are the known overpowers?