Question Mark Entertainment offers the futuristic looking Motion Speaker.

With a wave of your hand you can adjust the volume or tune in to a different FM radio station. All under a soft ambient glow - how nice is that?
The Motion speaker can be powered via USB, 4 AA batteries of 6V Power adapter.

QM Entertainment is shipping the Motion speaker starting next week in some European countries for 79.95 Euro (~$100). QM Entertainment also will offer the Moody Speaker. This PC stereo speaker features a pulsating mood-light, in Blue, or White (manually switchable). This speaker will retail around 39.95 Euro (~$50).
More details on the Question Mark Entertainment site. (Thanks Jeroen)