I would bet that there are many people out there that use Android smartphones and have gobs of music on an iTunes account that they would like to get on their Android device. If you are one of these folks a new app from ParkVu has surfaced called Music WithMe that will allow you to access your iTunes playlists on Android devices.
Even with iTunes the primary music source, Google has been building on it's own music service. Possibly as early as this fall Google will have a system that allows you to download and stream music. It's been signaled by Google that they want to offer better music support to those with Google's Android.
Keeping all your iTunes music is a deciding factor for most potential Android users. iTunes has been around for years and many people use it as their main source of music storage. Most people decide to stick with the iPhone just because of the iTunes integration. Now you can keep all your music in iTunes and sync them to your Android device thanks to MP3tunes.