The current icon in the cvs tree for the Android OS (wwwroot/icon/os) is an Google Chrome icon.
Attached is an Android icon.
You should also change the URL on the operating systems detail page
from: http://code.google.com/android/
to: http://www.android.com/
as this is the main android site.
Android OS icon
Added/Fixed in CVS tree. Will be available in next version.