This has been reported by several people, so I thought I should post it here. The issue is with intermittent, random bursts of static when using an iPod through the USB ports (1 or 2). Here is a video demonstrating the problem (most evident around the 2:00 mark):
I tested with 3 different 6th Gen iPod Classics (160GB Fat, 120GB, 80GB with flash memory conversion), as well as a 30GB iPod Video (5.5 gen). All exhibit the problem. Tested with both the Pioneer CD-1U201V (iPod cable) and a genuine Apple 30pin/USB cable.
The noise only occurs with the iPod, not with any other source (