As you know, Kinetic scrolling is the popular term to denote the scrolling of a long list with a bit of physics, so that user feels like moving a wheel. The kinetic scrolling feature popularized with the iPhone isn’t just a way to simulate a slot machine with your data, it’s a quick method to zip through lists, scroll through e-mails and surf the web...(this feature is also available on the N97, 5530 XM and 5800 XM)

QT Labs have posted a new example of how to enable kinetic scrolling on widgets applications, check this out :