I've also got google analytics on all my stuff and I use the analytics that Squidoo provides to see how I'm doing. But...
I get some of the damndest search terms that I would have never thought of... and they don't show up on any of the search software that we all use.
Anything that shows up three times or more gets an article or something targeting that keyword phrase, if it keeps showing up, I'll do a squidoo about it.
This has steadily increased my article views and my standings in google. I know it's off-the-wall marketing, but if 10 people a month search that term and you get 8 of them, that's just gravy that you've been letting get away!