In the U.S., high definition TV penetration has climbed steadily in the last year.  In December 2007, 13.5% of U.S. households HD TV sets — by this November that percentage had grown to 23.3%.
Who are these HD TV adopters?  According to a new study released Monday by Nielsen PreView, these HD equipped homes tend to be upscale, college educated, and have younger heads of household.  Sixty percent of HD homes also own DVR machines — compared to 24% of all homes in Nielsen’s National People Meter sample.  Nielsen Preview also …