WOW!

That is the most detailed response I have seen in a Q&A.  Thanks for going to so much detail.

Definitely write this up as a YouMoz, as I have a feeling this would be a great interest to a lot of people, and could well get promoted to the main blog.

Right, I'm off to fire up Analytics and Excel and see what I can see.

This truly is brilliant.  Thanks so much.

Keri, thanks for the heads up on the alerts blog post.  I have used alerts, but for some reason I just didn't think to use these to identify changing trends in keyword usage.  So I will give this a look also.

Thanks Guys