I noticed a recent improvement on Technorati's Search feature : when you search for sites linking to a blog, they now specify whether results are returned because of their content (i.e. someone wrote a blog entry containing a link to some site) or because the site uses a theme that matches your search query.
This is a nice technological improvement : except for K2 that adds some meta data in the <head> ("<meta name="template" content="K2 Beta One r73″ />"), making theme identification quite easy for a search engine, other WordPress themes produce no theme specific content but the link to their stylesheet, pointing to wp-content/themes/yourtheme/style.css. So I guess the Technorati folks built their own list of WP themes so that they can filter search results.
I don't know if this is part of their plans, but Technorati seems to be a few lines of code away from making a WordPress theme list ranked by popularity and number of links. Similarly, you'll notice that use of the WordPress software is highlighted on search results for binarybonsai.com, so we can easily imagine better blog profiling in the next future (blog engine and theme used), and why not blog engines market share statistics (this would make a particularly interesting trend to follow on the long run)
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