For the past six weeks or so, I've been collecting sales rank data from Amazon.com to compare how both formats are doing. I've compared both the hardware and the software; I've decided to put this here for discussion as it seemed the most likely place. As a retailer, Amazon is large enough to give us a broad sense of how products are selling but still small enough that they don't exactly mirror overall sales. Comparing their most popular books and albums, for example, does not give you a bestseller list or a Billboard albums chart. Amazon.com's sales rankings work by ranking each product within a category against all other products: Blu-Ray and HD DVD players are ranked against all other electronics, and software is ranked against all over DVDs. There is no information regarding unit sales, and the lower you go in rank, the more unreliable the numbers become. It's best to think of sales in logarithmic sections: the Top 10, the Top 100, the Top 1000, etc. Ranking is also constantly updated as the day goes on: if sales pick up in the afternoon, a rank is likely to increase, for example. Given these inaccuracies, I thought it would be interesting to see how HD DVD and Blu Ray were doing on Amazon. Here are my results: Hardware (and some Software) First, I tracked hardware sales of Toshiba's two models, the RCA, the Samsung, and Sony's, which is only a pre-order at this time. Second, I tracked these against Oppo's OPDV971H player, which is one of best selling upscaling DVD players on Amazon. Finally, I also tracked the best-selling title on disc for HD DVD and Blu-Ray. I did not have a chance to check each of the dozens of titles every time, but generally a few titles always sell very well for each format and Amazon ranks the titles as "Bestsellers" per format although (frustratingly) it doesn't correspond to the titles ranking. The average sales rank from 7/25/2006 to today is as follows: Oppo OPDV971H: 157 Toshiba HD-A1: 501 Toshiba HD-XA1: 7,500 Samsung BDP-1000: 8,754 Sony BDP-S1: 9,312 RCA HDV5000: 11,765 HD DVD Bestseller: 680 Blu-Ray Bestseller: 3,720 It's also in chart form: HD Charts.