Concept: “No one who knew you as a man yet lives. No one who knows you as a legend will believe you.”
Content: A semi-dead warrior pulled from Valhalla back in the Dying Land
Writing: Lots of compelling imagery and mythic flavor
Art/design: Graphic elements reinforce the themes; otherwise emphasizes usability over expressiveness
Usability: Multifaceted class features provide formal benefits as well as impetus for creative problem solving 

Concept: “Sorcerer. Magician. Witch. What you have traded for your terrible secrets will always haunt you.”
Content: An Omen- and Power-oriented class with access to 3 sets of 6 alternative Powers with special mechanics
Writing: Clear descriptions of mechanics and some appropriately anguished, esoteric flavor
Art/design:  Relatively conservative but visually and thematically appropriate; features some insidious-looking flora and fauna
Usability: Straightforward; use of color is good for fast visual reference

Concept: “The Spawn of the Black Forge hath come. Their flesh weeps inside pyg iron cages, spurred forth by the infernal engines of their burning brimstone hearts.”
Content: A trio of machine-themed enemies
Writing: Includes an overview, tables for origins and encounters, and individual descriptions and stat blocks
Art/design: Fits a lot of content onto a single spread without compromising comprehension or usability
Usability: A toolkit for small adventures or campaigns set amidst an all-out invasion