1) Use an Apple AV cable with your iPod device. Check the description to make sure the cable works with your iPod. I don't recommend the old iPod photo cable as it doesn't come with a charger device also. The other 2 cables let you charge your iPod while watching TV so that your battery doesn't die midway ;-)
Apple Composite AV Cable:
Apple Component AV Cable:
iPod photo AV Cable (don't buy this):
2) Use Apple TV:
3) Use a Popcorn Hour A-110
4) Play using your Xbox 360 or PS3 either by hooking a USB device to your console or streaming the media to it using software such as TVersity.