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Skype uses QT only on Linux, On the Mac is uses Cocoa. You can find this out by looking at the exported names from the binary, only Cocoa and standard C names are used. It does not link or use QT in any way on the Mac.
Same with tons of other applications, such as Mathematica which uses QT on Linux, Carbon on Mac and the standard GDI functions on Windows.
A lot of people seem to think that if an app uses QT on Linux, it uses QT on all other platforms.
One of big problems with QT is that non Mac users have no idea how terrible QT applications look and behave on the Mac. Edited 2008-09-16 16:08 UTC