iOS 4.3 may not be a huge upgrade, but it is the little things that make it enjoyable to use and AirPlay streaming YouTube audio is something I thoroughly enjoy.
I used to have a 5m audio cable in my living room, this length was needed to not give up portability, but having the sound completely wireless is much more comfortable.
Has anyone tested AirPlay with existing apps? Apple made it sound, as if only supported apps will be able go use it, I.e. the app developers would need to update their apps, haves far all apps I have tested support it. Radio apps, games such as N.O.V.A, SymphonyPro, etc. That all my apps support it is a welcome surprise. I had expected it to take weeks for developers to update their apps.