GeorgieLabs
SoundWire (free)
FreeSoundWire lets you stream any music or audio ("what you hear now")from your Windows or Linux PC to your Android mobile devices.
AndroidMusic VU Visualizer Widgets
FreeMusic VU gives you beautiful and dynamic level, wave, and spectrum displays for your music, right on your home screen.
AndroidSoundWire
PaidTurn your android device into wireless headphones / wireless speaker.
Android
