InformationWeek: Unlike Apple, Google does not review apps before they appear in the Android Market. As a result, apps that don't work or contain malware are not uncommon.
In a statement to the FCC, Google explained, "Once an application has been uploaded by the developer and made available for users of Android-powered handsets, the Android Market community is relied on to flag applications that do not abide by our policies."
Google also told the FCC that about 1 percent of the apps it posts are eventually removed. Since the Android Market currently has about 22,000 apps, that would be about 220 bad apps.