I purchased the iMainGo2 portable speaker system to go along with my Zune MP3 player to enhance my BirdJam experience. The sound quality of this portable speaker is excellent. It is very simple to use and the battery life was better than expected. The plastic protective screen does not limit your ability to use your iPod or Zune. The structure of the case if durable and well padded, yet the unit fits easily into my paw. My only complaint is that in the cold weather the hot-glue used to secure the speaker broke loose. I'll have to figure out if I can disassemble the unit to resecure the speaker and restore the sound quality.
Price: $39.95 plus shipping when purchased online.