I think it's pretty disturbing how regularly Apple's ideas get ripped off. It doesn't do anyone any good, because it makes the whole idea of patenting utterly trivial. It's pretty sad that so many of Apple's ideas have been shamelessly ripped of by companies like Microsoft and others. The more this happens the worse it gets for people who actually come up with creative ideas and want to start companies.
Ripping off ideas is absolutely legal. Ideas are ten a penny. Design is not an idea. "We'll make a tablet that has a really nice design" is an idea. Anybody is allowed to rip off that idea. Ripping off the actual design is what is not allowed. Patents are also not ideas.