The Multimedia over Coax Alliance (MoCA) has been ratified with certified devices in pipeline: MoCA's standard allows existing coaxial cable wiring to carry up to 270 Mbps, competitive with the HomePlug Powerline Alliance's 200 Mbps HomePlug AV, which should appear in products shortly. Coax is already installed in many newer homes and retrofitted in older homes, making it widely available. Coax has very high short-distance frequency capacity, too, which gives this standard its speed.
While cable companies often provided the inside and outside coax wiring, it looks like Verizon will be poised to leverage it with their fiber to the home (FTTH) plan called FiOS. The FiOS system will bring fiber to the home, but distribution could be via many means, including coax. HomePlug AV should certainly be an option, but it's further behind production than MoCA's standard. This Telecomweb article lists a number of firms with products ready to ship: Actiontec, Entropic, Linksys, Mototech, Motorola, Panasonic, 2Wire and Westell. Verizon Labs handled testing.
The race for 200 Mbps or faster seems to be engaged on all fronts. The 802.11n spec offers 200 Mbps at a minimum with no optional services turned on, like double-wide channels. HomePlug AV weighs in at 200 Mbps. And the HomePNA Alliance, which I thought had passed quietly away, seems to have revived late last year and is produced a 300 Mbps+ revision to its 240 Mbps HomePNA 3.0 spec that runs over standard home phone wiring. Version 3.1 might have some traction with the firms involved--SBC and Cisco's recently acquired settop box division Scientific Atlanta. While HomePNA 3.0 may have been ratified back in 2005, I can't find any products for sale beyond the 2.0 version.