Compared to other media set-top boxes, the Apple TV can appear somewhat limited. Out of the box it offers a limited number of channel apps and, unless you're invested in the Apple ecosystem, its AirPlay features are marginal at best. But the good news is you can get more content (a lot more), and additional functionality out of your Apple TV 2 with a simple jailbreak. It allows you to install popular apps like XBMC that make it easier to stream digital content throughout your home network. You're also able to find hundreds of internet channels like you'd find on a Roku.
Read the full article: How to jailbreak an Apple TV 2