It'll be a while before the real sales trends are clear
Zune won 9 percent of the U.S. market, measured by unit sales, and 13 percent of the dollar volume for the week ended Nov. 18, the market research firm reported. The numbers reflect Zune's first few days on the market. Microsoft released the device Nov. 14.
The iPod represented 63 percent of unit sales and 72.5 percent of dollar volume.
There have been signs that Zune's market share may have slipped since those initial days. One widely cited indication: The player debuted in the top 10 among Amazon.com's best-selling MP3 players but has since fallen lower in the rankings. As of Wednesday morning, the top-selling black Zune was at No. 17 on the Amazon list.