I still can't keep track of what iPad app will continue playing audio when out of focus. The Google reader app will not but if you play audio through reader in Chrome it continues to play. So I am yelling! Can't wait to try a Nexus tablet. I'm ticked at Apple's law suit and will not buy another Apple product. There are so many reasons to dislike this company. Yes, I'm in a bad mood.
Edit: This is not as big an issue once you get to know which apps do and do not continue to play in the background.