Via this article from Gizmodo, it appears that XM Radio will be starting their own internet radio time shifting service. That answers the the questions I had why XM would lean on Time Trax. They framed it as a legalistic issue, but really it was just a ploy to crush possible competition.
XM Internet Radio
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The problem with their new service is that I won’t be able to use it at work, as they don’t allow streaming. The standalone device is what I needed, but I waited too long to get it. Aarr Indeed!