Apple has responded to Nokia's lawsuit over network protocols back in October with a lawsuit of its own, claiming that Nokia has ripped off the iPhone user interface (UI).
Here's the lawsuit (PDF).
In the lawsuit, Apple turns Nokia executive vice president Anssi Vanjoki's words against him:
In response, Nokia chose to copy the iPhone, especially its enormously popular and patented design and user interface. As Anssi Vanjoki, Nokia's Executive Vice President and General Manager of Multimedia, stated at Nokia's GoPlay event in 2007 when asked about the similarities of Nokia's new offerings to the already released iPhone: "If there is something good in the world, we copy with pride."
Looking at the state of play of smartphones today, there are iPhone clones a-plenty out there. It's going to be interesting to see if this lawsuit is a one-off retaliatory strike or whether Apple is going to systematically pursue other copy-cats.