Access iPod from Windows Explorer
Do you mean an iPod Touch? IIRC "Enable Disk Use" is only for non-iOS devices. I don't know of a way in which you can manually copy songs from your computer to your iOS using the file system and have them play in the iPod.app on your iPod Touch. I believe Stanza allows you to copy ebooks from your computer to your iOS device but I'm not sure if it uses iTunes for that process.