This is fascinating stuff, particularly the demographic info:

Telephia research shows that more than two million or 1.4% of the US wireless user base subscribed to a mobile video plan during the first quarter of 2006. The average mobile TV subscriber spends US$40 a month more on wireless services than non-TV subscribers, according to Telephia.

[…]

Telephia shows that the Hispanic and Black/African-American demographic groups made up 23 and 19 percent of the mobile TV subscriber base in the U.S. during Q1 2006, respectively. This is approximately double the share these groups represent of the broader mobile user population.