One of the flagship iOS features to carry over to OS X Mountain Lion is AirPlay Mirroring, which allows users to mirror their desktop to an Apple TV. System audio can also be streamed to AirPlay-compatible devices, which means that apps without custom AirPlay support (like Spotify) can stream directly to an Apple TV or Airport Express.
AirPlay Mirroring is a great way to share content from your desktop, no matter what program you're running. It works well even for streaming video sites like Vimeo.
You can control AirPlay Mirroring via the new AirPlay menu bar icon, which shows up when there'
