Just when you finished replacing all your VHS tapes with DVDs, you heard that there are two new kids on the block, HD DVD and Blu-ray. They both claim that they're the successor to DVD, and that eventually they're going to replace it completely. If you've been watching this fight from the sidelines, confused by the differences between the competing standards, keep reading, and we'll explain some of the technical details behind the marketing hype.

First, let's examine the reasons for a change in media. According to the DVD Forum, consumer research shows that television screens larger than 36? rate ?poor? in picture quality when watching standard definition content.

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