"Since March of this year I've been running a private web spider looking at the number of web tags on web pages belonging to the Fortune 1000 and the top 1,000 web sites by traffic. Using the spider I've been able to see which products are deployed where, and how those products are growing or shrinking. The web tags being tracked are those used for ad serving, web analytics, A/B testing, audience measurement and similar."
- xero
from Bookmarklet