A skeuomorph user interface draws upon real world objects in its visual design in order to increase familiarity and the association between the product and its real world counterpart. Apple has been pushing this approach with apps like iCal:
I'm looking to do some work in this area and I'm wondering what some good examples are of skeuomorph interfaces that you've seen. Please don't just list more Apple stuff ;) Any operating system works, including web-based UIs.