That's a similar direction I'm headed in for http://www.iwaat.com http://www.iwaat.com. I think you'll see more sites like http://thetoolbox.cc http://thetoolb

That's a similar direction I'm headed in for http://www.iwaat.com http://www.iwaat.com. I think you'll see more sites like http://thetoolbox.cc http://thetoolbox.cc being created since searching for web apps from google.com is painful. And I can confirm from experience that most web apps have a miniscule amount of content to index, especially compared to blogs and other sites where content-centric sites. However, when you combine a web app's on site content with relevant content from the rest of the web (social media, news, etc), there's enough data to build a halfway decent search engine. The tough part of your vision is the store. Every web app has their own way of processing payments that would be tough to tie into a single site for an experience similar to Apple's App Store. Chrome Web Store would probably be best positioned to tackle this.