Google has modified search to include an Applications tab. You may have to click on more to find it. I first learned of this from Martin Hawksey on Google+.
At the top level, you can also filter by images, maps, shopping, videos, news, books, blogs, discussions, patents, recipes and flights. The filtering options will depending on the Google domain that you are searching from. I see all filtering options when I search with google.com, but flights and recipes disappear when I use google.cz.
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