Aha, answered my own question, from their FAQ:

Quote:
How is TiVo HD different from the TiVo Series3 HD DVR?

Both products are designed on the Series3 architecture so the core TiVo functionality is the same. However, the TiVo Series3 HD DVR offers a bigger hard drive (250GB), THX® certification, a front panel display, and a programmable, backlit TiVo Glo remote control.


Yeah, the only thing I'd want out of that list is the bigger hard disk, and I'm already solving that problem at the lower cost (hopefully).
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Tony Fabris