There was a video posted in the fanshots earlier this week and now here it is. You can go grab the official SBNation iPhone app from the app store now. It allows for mobile commenting and lets you follow whichever sites, teams or leagues you want. It's totally free and it works on all iPhone/iPod Touch/iPad devices.
For now the app is unfortunately only for iPhone. Our developers will be doing an Android version however.
So download it and let us know what you think.