Sharing iTunes library (Mac/PC)

NTFS-3G combined with MacFuse will allow the Mac OS X to read NTFS.

• Development blog
• NTFS-3G for Mac + MacFuse download

It's all a matter of picking a file system that both OSs can read/write to. FAT32 is another option. You can move your iTunes folder to a FAT32 disk or partition, however this will give you a limit of how much you can eventually store in iTunes. You could also move your home folder to the FAT32 partition if that's what you've formatted your Windows partition as.

Apple Support pages:

• Mac OS X 10.6 Help: Partitioning a disk
• iTunes 9: Understanding iTunes Media Organization
• iTunes for Windows: Moving your iTunes Media folder
• Mac OS X v10.6: Using MS-DOS (FAT32)-formatted disks for home directories