Apple is suing HTC, the maker of several phones running Google's Android phone OS, over about 20 patent violations. Apple apparently holds patents on things like event-driven software. If you've ever taken a CS class, this is the first thing you learn when you start writing GUIs. It's been around for a long time, and yet Apple has a patent on it. If the patent stands, almost every non-apple piece of software that uses a graphical user interface (if you aren't a computer programmer, this is likely every piece of software you use) will be in violation. That's not to say they'll all go away, some companies have their own portfolios of ridiculous patents big enough that they could counter-sue, and Apple knows it.