Do the DVD Empire numbers suggest HD DVD is going tow to toe with Blu Ray?
Do the numbers suggest that more HD DVD owners shop at DVD Empire?
There are two sides to every set of numbers, so in this case (an internet vendor that may acct for <1% of all HD sales), the significance is non-existant to either side.
We'll never see numbers that tell the whole story simply because they are not available.
The only valid conclusion to the DVD eEmopire numbers is that software sales are close for purchasers that visit DVD Empire. No significance to the war in general.