In case anyone is interested, I asked Pressplay why no Mac support. The response:
"Unfortunately, the Windows Media format pressplay utilizes is not supported by Macs. We look forward to future versions that will support Macs. In any event, since we are format agnostic, we would be receptive to using a format that meets our security requirements that is compatible with the Mac."
Perhaps Roxio will work to include Macs? Anyone know?
Maybe this "service" will fail and it won't matter.