I've gotten a hold of a series of videos in MP4 format and it has served it's purpose of being quite portable (watching videos on the go sans iPhone or PSP). Occasionally, I'd like to playback these videos at the comfort of my living room over my big screen TV (these videos were converted at 640px or higher). There is probably a million ways to do this nowdays (media PC, network storage, streaming, etc...), but the two methods I've been using has worked out quite well and doesn't require an intensive setup or technical knowledge:
Method 1: MP4 Playback from iPhone to TV via AV Cables
This is a tried and true method which I've done a write up for Griffin's Component Cable. Whats really nice about this method is that if you have to leave the house, you can unplug your iPod or take your iPhone with you and watch the videos on your commute. It does take a bit longer to sync your videos over iTunes and that is just the name of the game.
Method 2: Load in Jumpdrive and Watch via Playstation 3
This method has it's advantages in that loading the videos to a high speed jumpdrive such as my SanDisk Cruzer 8GB (Amazon, $13) is much faster than iPod to sync, I can also fast forward and pause via my Sony PS3 Bluetooth remote which adds many creature comfort over method above.
To set this up, connect your jumpdrive to your PS3 and go to your PS3 video menu and select USB drive; be sure to hit the triangle button to bring up the system menu and select "display all". Otherwise it may not recognize your videos. Some people said it would be better if you created a VIDEO folder and drop your files into there, it's up to you on how you want to manage your file structure. This method even gives you the option to copy your videos to the PS3 harddrive, but it was playing back just fine right off the jumpdrive in my scenario.
Obviously, this method offers a lot of convenience but I will lose the mobility of taking these videos with me while I'm on the go unless I opt for more advanced setup, such as remotely stream the videos from PS3 hard drive to my PSP over wifi.