My thoughts on Mage Knight have more to do with the Wiz Kids game adapting them for regular D&D play.
Recently I've been spending alot of time thinking about a mage-knight type character. For those of you who don't know what I'm talking about: A character who combines fighting prowess with arcane magic. However, I am un satisfied with a cross class fighter/wizard (or sorcerer). I think there should be more to it. Perhaps not all of the wizard/sorcerer spells should be available to such a class? Perhaps this character should have access to some spells that are not available to wizards and sorcerers? Perhaps something in the special column besides a familiar and bonus feats? Anyhow, I would like it if someone in Dragon thought this idea was worth pondering and wrote an article on this. Perhap it should be a prestige class, rather than a base class? Anyone else think this is a worthwhile idea?
Combining fighters and magic users has always been tricky. I'm assuming you found the Eldritch Knight prestige class in DMG insufficient... Have you checked out the Suel Arcanamach in the Complete Arcane? It's a little more unorthodox than the Eldritch Knight, and work towards gaining the class provides some good adventure hooks for players.
Do you frequent the WotC boards, Rowan? If so, pop into the Character Optimization board and look for the various "Gish" threads. They come up with some amazing synergy between classes, feats, etc.