To the guy who answered and said that Sony is the big bad wolf compared to innocent wittle Microsoft, get a fucking reality check. They're BOTH big bad wolves.
Blu-ray "won" because it's the better form of media. It holds more and thus can do more. It has many more features than the HD-DVD.
I think it's important to point out that Blue-Ray hasn't exactly won yet. HD-DVD might have lost, but I still don't see the general public clamoring to run out and get blu-ray players at prices of 600 + dollars each. The struggle is definitely still on.