I was looking for more information on Latent Semantic Indexing since I am approaching the point in my newsfeed search project where I need to augment search results with similar keywords. While doing a google-search I stumbled across this great article that really defines LSI and how it is helping search engines become smarter. This is an easy read and breaks down LSI into layman terms for the uninitiated...
The Need For Smater Search Engines