Throughout the series, most of the various Laws of Magic have been violated. And Harry himself has closely skirted some of them. Either way, it's always made personal for him. There's been plenty of killing with magic to go around throughout the series, starting with Storm Front. We've seen a story about the transformation of others, in Fool Moon. And, of course, Harry now knows what it's like to be transformed into a dog--oh, excuse me, Lea: a hound. Molly has a pretty intimate familiarity with transgressing into the mind of another in Proven Guilty and even more recently besides. Let's not forget Small Favor or Turn Coat, either. We don't see much in the way of enthralling during the course of the books except by historical reference in Summer Knight, but for Harry, that's History with a capital H. We've got plenty of examples of reaching beyond the borders of life in Dead Beat. They beat down his door, shot arrows at him, and left really big footprints while giving him a ride. Possibly we're going to see even more of that reaching Real Soon Now. There have been mostly only little tidbits here and there regarding the seeking of that which lies beyond the Outer Gates, but it seems like it's only a matter of time before Harry will once more have to contend with He Who Walks Behind, and perhaps worse.
That leaves one final law that strikes me as particularly interesting--and particularly challenging to make a good story for that doesn't come across clichéd--which brings me to my question:
Will we ever actually see a story where Harry must do battle with those swimming against the currents of time?
(Or perhaps we already have, and just don't know it yet)