yeah, it's cool, except the article has a number of mistakes, corrected at <a href="http://ekzept.livejournal.com/185329.html" rel="nofollow">http://ekzept.livejournal.com/185329.html</a>
This is kinda old news; what I would want to see is a framework incorporating persistent and updatable on the fly SVD recommendation / latent semantic indexing.