Here are a stylish on/off radio button created with vector shapes. Free PSD released by Barry Mccalvey.
Freebies tagged radio
Douban.fm is a cool radio player widget with some basic clean controls. Free PSD designed by Celegorm.
Douban.fm PSD radio player
This Blue UI (user interface) kit includes everything from checkboxes, radio buttons, and toolbars, to search boxes and tooltips.