iPhone causing speakers make buzzing and popping sounds

This is quite normal in mobile phones that use GSM/TDMA technology. Basically, the radio signal is being split up in time so as to allow the maximum number of users to access the network. The signals are being picked up by your speakers, hence the interference. It does however seem to be more of a problem on the iPhone than for other phones. Also, if your speakers are not sufficiently shielded from RF interference, they will pick up the interference.

Not really much you can do except for maybe getting new speakers, or making sure the phone is as far away from the speakers as possible.

I get lots of buzzing on my computer speakers when the phone is too close to them. Same thing happens in the car. I've never seen or heard any other cell phone do this, or at least not this loud.

I've had several GSM phones before, and they've all done this. But you are correct, they haven't been as "bad" as the iPhone in this respect. Not very much to do about it I'm afraid, apart from what I said above.

I live in a condo and our bedroom wall is shared with our neighbors. If I put my iPhone on my nightstand, it will cause our neighbors alarm clock to freak out (our newer alarm clock is fine, though).

You can hear it through the wall it's so loud.

Needless to say, I don't put my phone on the nightstand anymore.

Clearly a case of mobilus interruptus...