Well, at long last I've actually gotten involved in a proper publication - no surprise, I should hope, at the topic. With a collection of talented writers from the Playground and beyond, I've had the good fortune to contribute material to the Manual of the Planes, a companion piece to the official Planescape setting that explores all the parts the main book does not. Featuring in-depth looks at the various planes, more planar monsters, and a bunch of adventure hooks and general DMing tips, if you're looking to run Planescape then this is worth checking out.

Manual of the Planes