The multi-touch language is getting complex. In addition to the iPhone conventions and the long press we saw at the keynote , the new iPhone 3.2 Beta 4 is adding the triple tap . [9to5]
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Update: Actually, this already exists in the iPhone. We thought it was triple tap as in three taps on the screen, but this refers to three fingers tap. And the long press is already on the iPhone (to uninstall applications, copy and paste, and open URLs in new Safari pages).