It's Costikyan not Kostikyan (oops). http://www.costik.com/ -- he also has a blog about game design which *supposedly* has an RSS feed (so you could read it via your friends list here) but I can't work out how to get it working...

Anyway now I look at his site, there's a whole heap more than the couple of articles I've already read. Guess I'm going to be a busy reader for a while...