[mythobit]

I created a site on app engine that essentially does the same thing via Google Custom search engine. Granted mine isn't as integrated or user friendly but still. The site is: http://blacklist-search.appspot.com/

Why can't Google offer something like this rather than only allowing it via a Chrome extension?

[Matt_Cutts]

I think we can, but that sort of code takes longer to write, test, and launch. You'd want it to be really robust before you showed those sorts of options to 1B+ people a day. So the Chrome extension is a good interim step to see how much traction it gets and what sort of data emerges as a result