Google Search now allows you to search specifically for mobile apps

Google has added another new option in the sidebar of their search engine. This new option is named Applications and it allows you to restrict your searches to mobile apps. Example Search

This specific search engine would show results from multiple mobile app stores in addition to related sites.

Some of the sources include:

Google Android Market
Apple App Store

We believe that the company might be supporting tags to allow web publishers to add relevant code to their own web pages to get indexed on this specialized search engine.