At the last available reading, on 2006-02-23 iTunes had been 1032 days old, giving an average download rate of 969074 songs per day. By a simplistic logarithmic calculation, the number of downloads has doubled approximately 29 times, or about once every 34 days. Assuming Moore's Law holds, iTunes grows 1586% faster than digital storage capacity and microprocessor power.

12 - 17 year-olds are nearly twice as likely to interact with iTunes than average internet users.

iTunes users are 54% male and 46% female

iTunes Web site and use of iTunes up 241% in 2005 over 2004, reaching nearly 14% of the "active Internet population" or 20.7M unique visitors.

If people pay for online newspapers, how much will they loose

At $1 a month, with viewer retention of 70 percent, subscription revenue would be $566 million. But ad revenue would drop by 30 percent, or $933 million, for a net loss of $367 million.
At $2 a month, with viewer retention of 50 percent, subscription revenue amounts to $808 million. But newspaper sites would kiss away half their ad revenue, or $1,555 million, for a net loss of $747 million.
At $5 a month, and 30 percent of visitors sticking around, subscription revenue swells to $1.212 billion. But 70 percent of ad revenue, or $2.173 billion takes a walk, cutting the net by $946 million.
At $10 a month, sites retain just 10% of visitors, who pay a collective $808 million for the privilege, but 90 percent of ad revenue ($2.798 billion) flies the coop, leaving newspapers poorer by $1.990 billion.
At $25 a month — well, I won’t bother with the arithmetic. Make your own assumptions, but nearly all the ad revenue goes away and viewer fees don’t replace more than a small fraction of it.

Charles Leadbeater: The rise of the amateur professional

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