It's happening... unstructured text search. Been a long time in coming and when it gets into the hands of users look out, a whole new way to manage information.
Q: Why is this query so amazingly cool?
Because it searches a database of the blogs I read using a combination of freetext, structured, and regular-expression technologies
Because it uses XQuery 1.0 and XPath 2.0
Because you can subscribe to the results as RSS
Because you can modify it to create your own customized and RSS-accessible view of my database of feeds
A: All of the above. And yet...so what? ...