A quarter the size, no hard drive, streaming only, and $99. AirPlay arrived here and is still the feature most people use.
Released September 28, 2010 · Discontinued March 7, 2012 · From $99

Apple threw out the hard drive and started again. The second Apple TV is a quarter the size, streams everything rather than syncing it, runs an A4 from the iPhone 4, and costs $99 instead of $229. Dropping local storage was the whole insight: once broadband was good enough, keeping a copy on the box was pointless. Netflix was there at launch. AirPlay let you throw video from an iPhone or iPad to the television, which is still the feature non-technical people find most useful. It also became the most jailbroken device Apple made for a while, since the A4 ran iOS and the community wanted XBMC on it.
Reviewers liked the price, the size and the interface, and kept returning to what it would not play. Streaming from your own machines and from iTunes worked well; most of the rest of the internet's video did not appear at all.
Overall, Apple TV is a reasonably priced, well-designed device.
But it doesn't deliver most Internet video sources, or even all online network programs.