A searchable database of user-agents as used by browsers, search-engines spiders and crawlers, web-directories, download managers, link checkers, proxy servers, web filtering tools, harvesters, spambots, badbots.
This is one of the biggest things that determines whether or not I'm in the mood to read something at the moment, but no site gives it to me before I click. This is something that most sites can't do, more...