A Windows release is dependent mainly on just how well it integrates into iTunes. Apple place its "iLife" suite as one of the reasons to go to a Mac over a Windows PC and porting them to Windows would erode that advantage. Apple has had at least one major oppurtunity to port iTunes to the PC, the Windows iPod, but chose not to. If something as entrenched in iTunes as the iPod isn't enough to make them release a cross-platform iTunes then nothing will be. At any rate though, MS will come up with something similar for Windows Media Player soon enough. Not only do they hate being the last to get on a bandwagon, it'll give them a brilliant showcase of the Windows Media 9 DRM technology.