We're always asked the Google Analytics question. Here's a couple of answers we've prepared in the past.

HitTail - HitTail vs analytics
HitTail: Does HitTail Do Things that Google Analytics Doesn't?

But in short, we explicitly tell you what to write about on your website in order to systematically and incrementally grow your natural search traffic. See? The fact that we use some of the same data collection techniques as analytics software is almost besides the point. It's all about issuing the HitTail users explicit instructions on what to do next--and completely avoiding the paralysis through analysis problem inherent in most analytics packages.