We have just submitted this at the
Wappalyzer support page:
add support for K2 in this popular "web application analyzer" plugin for Firefox at
http://gsfn.us/t/fp7m!

If K2 is added to
Wappalyzer and the plugin is installed on Firefox, it will be easier for you to spot Joomla! + K2 powered websites.
If you wanna spread the word for K2,
please vote to include support for it in Wappalyzer here.
Thanks everyone!
UPDATE: Support for K2 on Wappalyzer is now a reality after v1.6.2. Install the plugin here:
https://addons.mozilla.org/en-US/firefox/addon/10229
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