I wanted to find some nice alternative to Distrowatch in order to check some distro's popularity. I found some nice google tools:
# Google's AdPlanner (site profile)
This one seems pretty clear and offers a lot of info on the website. Obviously, all this according to Google.
# Google Insights (search)
Also according to Google. A nice way to compare search terms.
It was cool to look for some websites like: fedoraproject.org, ubuntu.com, jamendo.com, etc. I really recommend you take a look at these.