According to this story Microsoft has just been awarded a patent for using different kinds of clicks -- long, short or double -- to launch different applications on "limited resource computing devices" such as PDAs and mobile phones. I would say I can't think of a stupider patent, but I probably can.
Single and double clicks, and click-and-hold have been around for what, 20 years? (Probably longer, but I don't have the details of the Xerox Star or Symbolics lisp machine interface at my fingertips.) This is just idiocy. I guess that if you were completely unaware of Moore's Law you could claim with a straight face that a Palm Tungsten E, for example, was a "limited resource computing device". The fact that it has roughly 128 times the RAM and 15 times the CPU of the original Macintosh -- which used different styles of clicks just fine, thank you-- and can display four times as much information on its screen would suggest otherwise.
And this is even before we get to the question of "non-obvious".