20 gb HD: $45 shipped
Wireless Controller: $30 shipped
AV cables (high definition): $20 shipped
rrod Xbox (error 0020): $80 shipped
Power cord and brick: $20 shipped. The power cord was actually chewed half way through by a dog. (lol) It still works and is securely held together with electrical tape. It's definitely not the safest for kids, though.
All offers are negotiable. Paypal only.

Update: Halo 3 collectors edition also for sale. $35. It doesn't come with the extra DVD but it comes with the cool booklet.