Re:No (Score 4, Interesting)

The folks who follow Amazon Sales Rank over time know that the Sales Rank tends to fluctuate and one needs to look at them over a period of time to draw any meaningful conclusion. The chart at http://charteo.us/amzn/compare/B000JLKIHA,B000H0QDCC/ looks at the Sales Rank chart for Apple 80 GB iPod Classic (Black) and Microsoft Zune 30GB Digital Media Player (Black) over last 3 months. Yes, the chart is live and compares Sales Rank for last three months from whenever you at it. The chart does show a spike in sales of Microsoft Zune during Oct.-Nov.'07 time frame, but then it levels off. In contrast, Apple iPod sales have been steady and better than its competitor for most of the time. The bump in Sales Rank of Zune could have been due to heavy discounts or special promotion campaign or both.

There is another factor to consider -- both Apple iPod and Microsoft Zune are available in different models and different colors, and each one gets its own Sales Rank. So comparing Sales Rank by picking a single model, even over a period of time, is misleading. As Sales Ranks are not additive, you can't simply add Sales Ranks of various models (or combine them in some interesting way, though this may be possible with some advanced math) to arrive at a single statistic.

I do a bit more analysis od Sales Rank charts of different iPod and Zune models in my blog post at http://charteo.us/The-Myth-of-Microsoft-Zune-Beating-Apple-iPod-as-Holiday-Gift-Item/.