Xbox – How to transfer the data from the xbox 360 S to xbox 360 S

Downloadable content should be able to be redownloaded at will, so you shouldn't have any issues there.

For your other content, such as saved games, movies, etc., you have a couple of options:

1. The XBox 360 hard drive transfer kit, if you have one around.
2. If the content is sufficiently small, you can use memory cards, manually moving the data onto the cards, then onto the target XBox.
3. If the content is larger, you can use up to 16GB of USB-based memory now. So a 16GB flash drive can be recognized for store-purchased, as well as in-game (saves, etc.), data.

Once the data is transferred, you will also want to transfer your licenses for content. Instructions are available on the xbox 360 site.

According to the Microsoft Store, the Data Transfer Cable will work with Xbox 360 and Xbox 360 S consoles. Note that it will do regular to regular and regular to S, but not S to S.

As far as DLC licenses are concerned, there is an option in your accounts in the dashboard to transfer all of your licenses to the console you are on. It's in Guide > Settings > Account Management > License Transfer. There is also a webpage about license migration here.

Update: A new transfer cable for sending data from a slim to a slim has just been announced. The Microsoft Store has yet to post the new cable, so you must contact customer support to order one at this time.