If you have a Mac-based HTPC, or often use your Mac for watching movies and TV, then you should really check out Plex. Plex is a fork of XBMC, the open source mediacenter for Linux, Windows, Mac, and the Apple TV. It combines and organizes all your local media with online sources; scraping together movie posters, plot details, album art, and ratings from websites like IMDB and TVDB to create an awesome media library.
On September 1st, the Plex Team will be releasing Plex 9, along with an iOS application that will allow you to control playback and stream media over a local WiFi connection straight to your iPhone, iPod Touch, and iPad. Judging by the video demonstration, it works beautifully, and completely eliminates the need to tediously sync each new episode of Futurama to your iPod Touch. It even starts the video from where you left off on your computer, so you don’t have scrub through it trying to find where you previously left off.
If you’ve built up a decent media collection, then give Plex a try. It can transform what was once just a jumble of videos into a stunning movie collection.