Apple (along with Palm, RIM, and the usual suspects) are all being sued by litigation happy patent-portfolio'er, WiAV Solutions, about whom Engadget Mobile says:
The company that doesn't make anything or even have a web site, but files so many patent lawsuits that some companies have taken to pre-emptively filing suits for declaratory judgment against it.
Must be something super-non-obvious, remarkably novel, spankingly applicable, and about which there couldn't possibly be any prior "art", right? Turns out not so much: