Apple has released iTunes 7.4.1 which adds support for the new iPod nano (third generation), iPod classic, and iPod touch, plus create customer ringtones exclusively for iPhone.
iTunes 7.4.1 is available via Software Update and also as standalone installers.
More info and download links:
• iTunes 7.4.1 for Mac (38.3MB)
• iTunes 7.4.1 for Windows (49.1MB)