This year, sales of smartphones based on Google's Android operating system have begun to surpass Apple's iPhone in the U.S., according to Nielsen. With increasing interest in Android handsets, mobile application developers are starting to make business-specific apps.

Here are 10 apps from Google's Android Market, selected with the help of Google, that are popular and highly rated (on a scale of 1 to 5, with 5 the highest) by users.