I also enjoyed the Dungeoncraft articles.
For my new homebrew, I'm going a different direction. Not using a book, but using Campaign Planner - can't remember who it's by. Yes, it's just sheets with fill-in-the-blanks, but I went a different direction because of being inspired by it.
Before I get into mapping, building the realms, etc... I started with prestige classes available. I thought I'd try this because 1) it sets limits for what directions characters can go for 'builds', and 2) it helps me visualize the movers and shakers of the world.
Again, random non-book advice/ideas... Orkworld by John Wick had a completely blank map, and in the campaign chapter of the book, it listed areas/places of interest and their backgrounds. It left the placement of the locations up to the DM.
Of course, again, I know these aren't books that give campaign world creation advice; just some helpful (hopefully; if not helpful, I hope not actively hindering

) thoughts.
But, otherwise, I second Dungeoncraft