Jack Foster Mancilla: The likelihood of being able to access this audio is probably pretty slim but we'll definitely see. Another issue there is one of legality - recording conversations requires consent of all parties in 12 states in the US, and probably other countries as well. Of course, that's not a technical issue.

Colter Reed, asw: Right, that's the idea of Airfoil for iPhone

Jose Vazquez: Right, that was my thinking - see the link to Alloysoft's Signal. We won't be making remote software, as others can do that better. But I think Airfoil for the iPhone would still be useful for many cases.

Mr. Make Believe: As far as Win CE goes, we'll see what happens in the future. As for iPhone apps, they should run on the iPod touch as well, with no additional work. We'll see if that's actually the case, but it's a reasonable assumption for now.

Mike Krus: "Any app" on the iPhone? What are you envisioning here? Currently, the only app that really plays audio is the iPod portion.

Or are you talking about on Mac OS X, on your Mac? If so, have a look at Nicecast, which lets you turn any audio into an MP3 stream.