Air Home Video is a new Cydia app that lets you play video from your Camera Roll and Photos app using AirPlay.
You can now shoot a video on your phone, and without syncing it to your computer or hooking up to wires you may play it to a network connected Apple TV2.
You can trim down videos to only view a portion of it. You can also select Low or High Quality streams. Low will compress quicker, but will, of course, be a lower quality of video than High.
You can purchase Air Home Video from the Cydia Store for $0.99.