An illuminating patent from Apple
An Apple patent application under the name "Illuminated touch pad" has been published by the US Patent & Trademark Office. There are several innovations detailed in the application, but it pertains primarily to touch sensitive inputs that provide light-based visual feedback. Among the variations included is a system that provides feedback with variable intensity (or color) based on direction and speed of the object in the sensing field. It's a possible indicator of some future advancements in the interface of the iPod classic.
The technology presented could be used in a multitude of devices, current and future. Ultimately, it's another indicator that Apple will continue to refine the user experience in innovative ways. Of course, I never had many doubts in that area. The MacNN has a detailed description of the patents applied for.