Tooltips in the era of touch

Question

Tooltips are an incredibly useful interface paradigm to know an application. They are the mapping between the visual control and the application specific action associated t

Answer 1

What about touch and hold? I think that would be a fairly simple interface rule in terms of both usability and implementation. Like a lot of things to do with usability though it will be hard to say until any one idea has been around for a bit of time to see it used in a bunch of different contexts...