Earlier at Apple’s “Let’s Rock” event, iTunes 8 was unveiled along with the new firmware for the iPod (version 2.1). Well, it’s live now, so head over to Apple’s website to download iTunes 8 or plug in your iPod to update to 2.1 via iTunes. In order to update your iPod, you have to have version 7.7 or version 8 of iTunes.
Oh and Quicktime 7.5.5 is also available.
Source: TUAW