The Amphibx Waterproof Armband is an eighty dollar iPod case that straps to your arm. It's got a few things going for it: it's large enough that different MP3 players can be tucked inside (there's few things that irk me more than buying cases and then having to toss them when I upgrade); it's submersible up to 12 feet, which is plenty for swimming and even snorkeling; and its "ClearTouch" window actually will let you activate the touch controls of an iPhone or iPod touch, even in the water. So if a little crab starts changing your music to Under the Sea, be aware: you're about to be seduced by a redheaded mermaid who's going to drag you gurgling and coughing to rest on a shelf of her briny wunderkammer.
"What's the word? Oh, giggle: murder."