There is a new crossplatform websharing platform called Tonido. It allows for a computer or hard drive to be accessible from anywhere on your home network or on the internet. It is free and an extensible open platform. They are monitizing it with a $99 plug in device that runs their software and connects to any USB storage device. There is similar device called Power plug.
I was thinking why couldn’t the software run on the AppleTV. It is always on and is already connected to the internet. With ATV we can already hook up large external storage (DROBO anyone?) so this seems the next step to utilize the ATV when it isn’t putting media on your TV or a/v system.
The mind reels from the possibilities. http://www.tonido.com/