Recently I wrote about Yahoo’s Mindset, and how it was helpful to searchers in: Sorting Commercial Pages from Informational Pages.
Have you seen Microsoft’s variation on this topic?
Microsoft’s AdCenter Labs has a demonstration page that allows you to see how commercial a web page or query might be, based upon Online Commercial Intent.
Looks like Lisa Barone, Tomy Lorsch, and a few other folks wrote about it when it came out at the end of the spring.
If you would like to dig deeper into how it works, the paper behind it, Detecting Online Commercial Intention (OCI), was presented at the WWW2006 in Edinburgh earlier this year.