Having pioneered multi-touch for its iPhone and iPod touch handhelds, Apple later extended the technology to trackpads on its Mac notebook line and now appears ripe to introduce the first iPod click-wheels with similar capabilities.
http://www.appleinsider.com/articles/09/06/04/apple_working_on_adding_multi_touch_to_ipod_click_wheels.html
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http://www.appleinsider.com/articles/09/06/04/apple_working_on_adding_multi_touch_to_ipod_click_wheels.html
http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=8&p=1&f=G&l=50&d=PG01&S1=((%22Apple%22.AS.)+AND+20090604.PD.)&OS=AN/%22Apple%22+AND+PD/06/04/2009&RS=(AN/%22Apple%22+AND+PD/20090604)