If you are not subscribed to the free e-newsletters offered by voices.com, please sign up today. You will see a link to subscribe to VoxDaily when you get to the post. This would be in addition to the voiceoverxtra.com information I have already mentioned.
We talked about listening in our first class and in fact your first homework assignment is about listening. Here is another source supporting how important listening is to your voiceover potential. Be sure to read the comments at the end of the post.
http://blogs.voices.com/voxdaily/2010/08/listening_to_voice_overs.html
