iPod accessories are starting to consolidate, and here's the prime example, the Soundbag which is an iPod case with a built-in speaker and a charger. It connects to your iPod via a built-in dock connector, and also has another line-in port where you can connect other MP3 players, laptops or DVD players to play sound (or it might be classified as noise) out of its tiny flat panel speaker. Then, you can carry the whole business around by attaching its carabiner clip to your belt. It's $70.

Soundbag - the iPod case with built-in speaker and charger [TechDigest]