Google Nexus One User Manual page 305

Market
To flag inappropriate applications
If you discover an application with graphically violent, sexual, or otherwise hateful or
offensive content, you can report it to the Android Market team.
1 Open the details screen for an application.
You can do this by browsing or searching for the application and then touching it;
or if you've downloaded the application, by touching it in the list of your
downloaded applications.
Scroll to the bottom of the details screen and touch Flag as inappropriate.
2
3 Touch the reason you find the application objectionable.
Touch Submit.
4
Your comments are sent to the Android Market team.
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Nexus One User's Guide