Wires are so out right now. Grundig knows this, and that's why they've come up with the PSW 5000 wireless speaker system. Simply plug in the transmitter to a line-out source (such as an iPod) and watch as your music is wirelessly transmitted to the speaker, indoors or out. The speaker isn't exactly a slouch, either, with 20 watts emitting from the waterproof housing. While not exactly a DTS sound experience, the system does produce 360° surround sound. The MSRP is about $190, but you can find it online for slightly less.
Hope you like the color, because that's all it's available in.