Plex on the App Store has dropped to £1.49 which is half it's usual price. The best cross platform streaming app, usually only stays this price for a few days:
Plex organizes all of your personal media, wherever you keep it, so you can enjoy it on any device. With Plex, you can easily stream your videos, music, photos and home movies to your iPad, iPhone or iPod Touch from your home computer running Plex Media Server (available for free at http://plex.tv)
Good for all those that took advantage of the recent cheap Chromecast deals...
EDIT: now half price on other platforms too: Android £1.16 and Windows Mobile £1.49