One thing I don't believe that HD-DVD will make SD-DVD obsolete anytime soon. Titles on HD-DVD will be very slow at first. All HD-DVD players will be backwards compatible and HD-DVD players will make SD-DVDs look there best. You'll be glad that you have your many SD-DVDs to watch until there High Definition replacements arrive. Also since HD-DVD and Blu-Ray have the same size, shape, and lasers I am sure there will eventually be a player that plays both formats.