Key to the data transformation is the Extensible Stylesheet Language, which provides information to identify what type of device is requesting information and what kind of network it is running on.
It wasn't very extensible, and their whole partership with Microsoft to deliver content to PMCs never really panned out, but today TiVo is expected to announce an enhanced TiVoToGo service, which would allow subscribers to transfer recorded programs directly to their iPods and PSPs.