I finally got around to reading the Crimson Fist short story in Heroes of the Space Marines. There's nothing like reading stories about the army that you're collecting to motivate you. Though the story was short on action, it did give some interesting insight on the chapter and allowed for the introduction of several characters, inlcuding the grizzled old scout sergeant (which is the counterpart to Sgt Telion of the Ultramarines).
While not without it's contradictions, I really enjoyed it. If you haven't already, I'd give this one a read. It provides some detail on the background of the chapter as it exists today (post Rynn's World campaign).