Of course it was only a matter of time until someone took the Star Trek LCARs interface and wrote an app to literally turn your iPad into a Star Trek PADD. The most interactive and useful one I've found so far is called LCARS Internet Media Reader by the guys at Krueger Systems [iTunes Link] ($4.99 USD). Its mainly a Reader app for now without the ability to post but updates are hopefully in the works once they get some annoying legal issues worked out with the Studios.
A few other LCARS related apps that I've found and like are:
Come on Paramount! Where are the Official apps? You have no problem having Captian's Log yanked from the App Store yet you haven't given the fans what they are obviously willing to PAY for.