mayest - 5:00 pm on Aug 21, 2008 (gmt 0)
I added it to my 404 page yesterday. Out of several attempts (3 or 4) to access incorrect URLs, I only got a suggested URL once. That one URL suggestion was dead-on correct, though. The search suggestions seemed to work really well. The desired URL was always in the top few on the results page. So, I like it. The best thing is that I was about to try to develop my own solution in PHP so this really helps and is probably better than what I would have hacked together.