There's a new blog in town by MySQL consulting guru Nitin Borwankar. Nitin's working on a few super secret startups and invariably they are using a lot of open source technology to create sophisticated tagging systems that create "folksonomies" or tagging systems that are developed in a collaborative fashion. Sounds easy, but how do you map that in and out of standard MySQL? Ahh... that's the question. And Nitin has some practical answers borrowing from data warehousing techniques that help illuminate the way. You may not always agree with how Nitin's does it, but its thought provoking stuff. Especially if you're trying to scale out massive Web 2.0 applications. This is leading edge stuff.