You can see the status of your drives.
And enable / disable the dlna services and the iTunes service.
You can also connect a USB storage device for extra storage.
You can also access your data via the Shares shortcut on your desktop.
Remote Access
Use the Mobile Access feature to remotely access your photos, music, documents, and videos through an Apple or Android mobile device. You’ll need to install the WD 2go and WD Photos mobile apps from the Apple App Store or Android Market for this purpose.
First though you need to enable Mobile Access and create an access code.
Then you need to choose either the free version or the Pro version.
Once installed, just tap the icon to launch.
Then you tap Connect Now, and tap on your device.
Then enter the activation code and tap Activate.

I have tried PogoPlug, which this appears to simply be a more full featured take on the same idea. The big issue was with remote access, streaming, etc. you are limited by the upload speeds of your home network. That at times was a very big and frustrating limitation.
thanks Anthony
I have a PogoPlug here for review and so will compare the two.
And I agree, upload speeds are a big issue!
I got a WD My Book Live Duo 2 days ago. Everything worked well after the instalation but suddenly the server was gone from my MacBook pro and my IMAC’s Finders. I called the technical support and he confirmed that this issue has been reported in OS X 10.6 and 10.7. This person said that they had to talk to Apple because the problem is with the OS X 10.6. Has anyone experience this issue? Any fix?
Thanks for this – I haven’t experienced this myself, but let’s hope a fix is forthcoming soon though.