Moving to HD is expensive.  You have to buy a new TV, new DVD player, and possibly a new receiver.  If you've ever wondered if HD-DVD (or BluRay) is worth it, this demo I found may be interesting.  These are a series of pictures taken from the DVD and the HD-DVD or BluRay of the same movie.  More than just a series of pictures, they are flash animations.  You can drag a bar back and forth across the screen and see the differences.  Give them a try.  The differences are stark.  Here are the two I recommend:

Link via the HTGuys.