World Building is a new PDF from Bards and Sages.

According to the blurb, “Instead of offering a step-by-step blueprint, this product provides writers with a way of thinking in order to insure that your fantasy setting is realistic, consistent, and playable.

Not having a demo available drives me nuts (why do PDF publishers do this?), but it does sound interesting.

Update: Julie Dawson, of Bards and Sages, has made a preview available.