As Sportsunit noted , Zune has debuted in the number two spot, according to early NPD data. We're happy to see this but we know this is going to be multi-year investment. Quoting thestreet.com : For the week ended Nov. 18, Microsoft had a 9% unit share and 13% dollar share of the U.S. portable player market, while Apple had 63% unit share and 72.5% dollar share. Also, retailers are telling us that they've seen Zune delivering incremental sales, and that's resulting in growth of the category. So Zune...