Xbox 360 Noise Levels
I've got both an early Xbox 360 and the 360 Elite.
The earlier Xbox was awfully loud when playing DVDs but I can confirm that the Elite is near silent when watching DVDs from the in built drive or when watching downloaded DVDs. Also, its near silent when using the external HD DVD drive.
I'll keep the HD DVD drive anyway (saves taking my favourite game out the main drive lol) and get a Blu-ray one if they launch it.