I spent the whole week-end reading Stealing Harry + all three year of Laocoon's Children... Discovered it yesterday via a rec for one of your story, and once I begun reading, found out I just couldn't stop reading...
I love the way you've taken canon, twisted it all the way and make it believable. All of your characters, altough quite different from the way they are in HP books, are so well written that I never once was stopped by thinking that one doing this or that was OOC... I like the way you've mingled the four houses together, making a foursome that is much more three dimensionnal than the trio we're used to... All the while keeping enough of the canon(with the gryffindor and the trolls, the time-turner given to Hermione, and so on) that we can believe events could have unfolded that way... Also, by making Harry a Slytherin, you make sure there is no evil house, only different kind of people in it...
I'll keep reading that, that's for sure! There's nothing I love more than AU, well-written novel-length fanfiction, that's aimed toward an older audience than the original books... and your's sure a fine example!