Check out these fun OS calculators from the guys over at Mint Pass, although they are just designs, they do look like fun.
Both of these fun calculators are based on Windows and Mac OS, and as you can see from the photos they are designed to look like the calculators in both operating systems.
Personally I think these look really cool, and would love one on my desk, sadly we will probably never see them being sold as the chances of Apple or Microsoft licensing them are pretty slim.
via Technabob