a list of audio (and some video) lessons in Chinese that provide good listening exercises at a variety of levels.

great way of putting your ipod to use in learning Chinese.  Lessons at a variety of levels are available for free download, and you can subscribe for a fee for extra materials or even contact a tutor in China and pay him/her for personal tutoring via Skype (ie talking through a computer microphone online for a long as you like and all for the cost of a local phone call!)

- not to be confused with the above, this will allow you to access Chinese music downloads - another great supplement to language learning.