Some have asked for more detail on Away Mode and what it does:
Away Mode does the following when invoked:
The intention here is to provide a “user not present” state to the machine so you can walk away, know that your recording is going to happen (or not be interrupted) while not badgering the user with a screen, audio, etc. It is *not* intended to be a power management state. Today, this is the only way to ensure that your media center extender will always work w/o having to worry if your MCE host is turned on or not. Also is great in that the system does not have to wake from S3 to record – and become noisy in the process.
To be clear though - Away Mode is only offered with new PCs. Maybe not popular at the moment, but the best way to make sure that Away Mode machines work as advertised.