I'm new to Android development and I'm currently going through some tutorials.  When I setup a new Android Project in Eclipse, and select Windows - Android SDK and AVD Manager, in Virtual Devices, the list of existing Android Virtual Devices is empty.  Is it supposed to be?
From the pictures in the tutorial, it's pre-populated.  Can I download these AVDs from somewhere, am I missing something here?  Also, I'm developing this on my Macbook Pro.