ALL I want to do is play music from my PC or iMac through my audio receiver. What is the best way to do this wirelessly? I'm not that concerned with lossless, etc...I just want to know the best way to do this. What do you guys think?

Very basic answer, a wireless music streamer...
http://www.slimdevices.com

Can you use these with an iMac?

What does this device do v. just streaming the audio output from my PC or iMac to the receiver?

How exactly do these types of devices work?

Check this out..

http://images.apple.com/airportexpress/images/indextop06072004.jpg (http://www.apple.com/airportexpress/)

I think this is exactly what I'm looking for. But, it only works with iTunes, right? Anything like this that might work with other audio players or just the general audio output from a computer?

Thanks,

Dave

Why do you not use a simple line connection from the audio out of your PC to an audio in on your receiver?

I need something wireless. I'm not that stupid.

You sound like it with a response like that!