The Media Center, branded by Western Digital, is a 7,200-rpm hard drive (either 160GB or 250GB), combined with a reader of CompactFlash Type I and II, Microdrive, Memory Stick, Memory Stick Pro, MultiMediaCard, Secure Digital, and SmartMedia media.
The upgraded version, the WD TV Hub Live, supports Mediafly, Pandora, YouTube, Blockbuster, and Netflix.
It comes with a 1 terabyte internal hard drive and can sync media using a "watched folders" paradigm from either a Mac or a PC.
Seagate, Viewsonic and Iomega have similar media hard drives that can be plugged into a TV.
The WD TV Hub Live does syncing, which makes it a DLNA-compliant media extender, as well as a hard drive and streaming device.