Actually, the same accusation of inconsistency can be made of Windows too - just look at IE in Vista, compared to Windows Explorer. Why, Microsoft, why? It just looks weird.
There's more. Windows Media Player (in Windows 7 and Vista) is huge violator of the standard Windows interface. Not to mention, Word 2007, Excel 2007, PowerPoint 2007, Windows Live Photo Gallery (which is sort of a cross between the standard interface and WMP's interface), etc. There's quite a few really.