display: none; Or The things you think are common knowledge but really they aren’t. Worth your time, especially if you are using responsive design and display:none; figures into what you’re doing.
Mobile Input Methods. Here’s another post that will teach you a lot about what you thought you already knew, but don’t.
Even Microsoft has given in to the touchscreen trend. As people scramble madly to come to terms with Windows 8, global moxie declares, New Rule: Every Desktop Design Has to Go Finger Friendly.