Last week, I received an email asking me to remove one of my applications from the App Store, saying that "they had been notified" that the name of my application was infringing on a registered trademark.
The name of my application?
Facetime. (http://www.apple.com/iphone/features/facetime.html)
Specifically, this is what the email said:
"We received notice from the trademark owner of FACETIME who has confirmed their ownership of registrations for FACETIME in the US and other countries.
Accordingly, please remove your application from the App Store and change the name of your application."
http://www.facetime.com/LearnMore.aspx