Review of Google's Chromecast - WSJ.com

From a Walt Mossberg Chromecast review

"But Chromecast isn't the first or only gadget to beam video and audio to a TV from a mobile device or computer. As is so often the case, Google's new effort directly competes with a product from archrival Apple, whose Apple TV has been doing something similar for years using a technology called AirPlay.
I also like and can recommend Apple's AirPlay. Its strengths and weaknesses are roughly the inverse of Chromecast's. Unlike Google's cross-platform approach, AirPlay only streams to the TV from Apple's own devices. And Apple TV, which connects the AirPlay stream to the TV, is costlier than Chromecast, at $99.
However, unlike the limited number of mobile apps that currently work with Chromecast, Apple says that AirPlay works with "thousands" of mobile apps, and with anything—not just a Chrome browser tab—that can be displayed on the screen of a Mac."

Review of Google's Chromecast - WSJ.com