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It keeps the air cleaner, it burns faster from the chemicals inside. This is a very good product I would insist on buying this over the other brands.

I'm a bit confused. First off, Underworld isn't even available on Blu Ray or HD-DVD. So I'm wondering if you really got to see true HD discs at all. Underworld Evolution is available on Blu Ray, but not on HD-DVD (it's a Sony release and Sony is Blu Ray exclusive, that is unless you're in Spain where it is available on HD-DVD). To answer you questions: 1) None really. Blu Rays currently can hold more space (50 GBs to 30 GBs), but HD-DVD is working on a larger size disc. Both can easily fit a "high def" picture of 1080 lines of resolution and uncompressed audio tracks. You should see no difference between a properly encoded HD-DVD and a properly encoded Blu Ray. Blu Ray was released before it was fully finished, so HD-DVD does a better job with PIP features and so forth. And it's this reason Warner Brothers hasn't released some titles like the Matrix and Batman Begins on Blu Ray. But Blu Ray should fully finish their software specs by the fall of this year. So that'll be even too. In short, no real difference to the consumer. 2) I'm not sure what you mean. It's true that many games haven't taken up a ton of space of the PS3. And there is a bit of a learning curve for programmers to program for the PS3. so that may help explain the lack of games and lack of titles "filling up" the discs. P.S. Why are there two formats? Basically Toshiba helped usher in DVD and made a lot of money of patents. The general industry/Toshiba then developed HD-DVD to make further money in a HD format. Sony missed out on DVD patent money and decided on their own to develop a new format (which they've tried many times before with Betamax, mimi-discs, SACD) to make more money on. In many ways they went outside the system and created a second format. So you could blame them. But it makes good business sense to do so, and they could cash in huge if it wins.