Here's a little amazing wireless dock that lets you leave your iPod but take the speakers with you.

Those wireless, 2-3/4-inch 3-watt spherical speakers operate on a wide 915 MHz frequency to guarantee there's negligible interference from other wireless devices, and they've got a respectable range of about 120 feet. Each iPod speaker is powered by a rechargeable battery that's excellent for about 8 hours of playback, and when used jointly they operate in stereo mode, or mono when separated.

The wireless iPod dock itself is compatible with the most iPod models, but also has a 3.5mm audio jack for linking pretty much any other audio source as long as you've got the right cabling. $149.95 on the Hammacher Schlemmer website.