Netgear is now shipping a Home Theater Internet Connection Kit that allows you to connect all your devices without cables and without a wireless signal.
The kit, which consist of an XAVB1004 Powerline AV Ethernet switch and a single Powerline AV Ethernet Adapter (XAV101) will get you started.
Then just connect your internet connected devices to the supplied adapters via Ethernet, and connect the other supplied adapters to your home's many power outlets.