A Google a Day.
A couple of things to note on the search education front. First and the most fun is Google's new experimental feature called A Google A Day. Test your search skills with a new puzzle each day. This could definitely be used with middle school kids and up to show them that search is a process that involves critical thinking. The answer link not only shows the answer, but describes the path.
Secondly, Google's search guru, Dan Russell has a new search education site where you are looking for educational materials, webinars and classes related to effective searching.
Finally, I stumbled upon this CNET article that describes Google's continued interest in educating people about search, and it sounds like there will be more to come in this area along the lines of A Google A Day.
Thought these resources were worth passing on. Keep on searching!