Is this a bug or nasty feature? I first noticed this using my Bluetooth stereo headset:
In the middle of listening to a podcast in iTunes (streaming, not downloaded) , I paused it. Then went to the home screen and pressed Music, selected and started playing the music I wanted to listen to. Then, if I hit pause on my Bluetooth headset, the music paused, but then the podcast started playing. From that point on the pause button would alternately pause and start playing the podcast.
To resume the music again, I’d have to go to the touchscreen and press the play button. And of course, pressing the pause button again on the headset would again stop the music and immediately resume the podcast.
To stop this unwanted behavior, I have to go into iTunes and press “Done”.
The same behavior occurred using the button on my Griffin SmartTalk microphone/wired headset adaptor plugged into the earphone jack (and am assuming the same behavior occurs using the Apple-supplied earbuds/mic combination).
Note: I experienced this behavior using my iPod Touch second generation with 3.0 software. I am assuming the iPhone behaves the similarly.
I’m curious if anybody else has experienced this.
Photo:
Bill Rodman's Blog 
This site was… how do I say it? Relevant!! Finally I have found something which helped me.
Thanks!