Sennheiser PX 100 Collapsible Headphones is a cool add-on for Kindle 2.0 that lets you listen to those audiobooks without sacrificing audio quality. The sound is very good and the earphones are very comfortable. PX 100 is one of the few headphones classified as Kindle 2.0 accessories on Amazon.

Sennheiser PX 100 Collapsible Headphone is collapsible and lightweight too. Overall, if you are looking for a decent quality headphone for your Kindle 2.0, PX 100 is an affordable one to consider.

Sennheiser PXC 250 Active Noise Canceling Headphones is great for occasions when you want to cancel noise. PXC 250  cuts out up to 25 dB of ambient noise. There is so much money that you can spend on noise canceling headphones, but this one is very affordable and high quality. I did have an issue with the battery holder, and I am in general not a fan of thse wired headphones. Other than that, these headphones are designed well. And they are pretty affordable.

Overall, if you are looking for a quality noise canceling headphones, Sennheiser PXC 250 is worth a try.