This week it has come to light that software called Carrier IQ is present on HTC and Samsung phones on the AT&T and Sprint network.
All the companies stated that the purpose of the software is to help diagnose problems with network performance. The uproar has ensued because the software could be used by carriers and device manufacturers to track all kinds of info on smartphones. It can be used to collect almost any kind of data from smartphones that have the software installed.
Look for major fallout over this, in my opinion. No one wants to have even the chance of their data being used without their knowledge.