You can get any content onto an iPod, but you can't take the DRM-protected content bought thru iTunes anywhere else, including streaming with Slimserver, etc. A

You can get any content onto an iPod, but you can't take the DRM-protected content bought thru iTunes anywhere else, including streaming with Slimserver, etc. And people now presumably have a large collection of content that is managed the iTunes-way, with a significant subset that is DRM protected. Meaning you're locked to Apple's devices.