How can I transfer data from one Xbox 360 slim to another slim?

I'm thinking about getting the Gears of War 3 limited edition console and I already have one of the new 360 S consoles. How can I transfer my data between the two?

I checked Google and couldn't find any new hard drive transfer cables, just the old ones. Normally I would just swap the hard drives but the Gears one comes with a 320 GB and I want to take advantage of the increased capacity.

I really don't want to move all the data with a 16 or 32 GB thumb drive, it would take forever. In theory, I should be able to just hook the two hard drives up to my PC (they have standard SATA connectors) and use Clonezilla. Has anyone tested this?

Any ideas for how to simplify this process are welcome.

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.