There are plenty of speaker systems out there for iPods and other MP3 players. And a few of them are readily adaptable (or at least portable enough) for use on a bicycle. But this speaker unit from iHome nails it: A water-bottle-size system that encases your iPod; includes a speaker, amp and batteries; and is weather-resistant. According to customer reviews at Amazon, it packs enough punch to overcome wind noise and even stir-up the neighbors.

In other words, it's perfect for cruising the 'burbs on your Mobiky playing George Thorogood's Bad to the Bone.

iHome Bicycle Speaker for iPods, $39 at Amazon.