The series, One Tree Hill, is a fantastic series.  Similar to 90210, but a little more serious drama.  Not quite as immature as 90210 and a little more realistic.  I have completely identified with the characters and there is great acting.

On top of all that, the music for the series is great.  Even my husband watches it with me and agrees on the music.

I have often looked over and caught my 11 year old son watching.  Completely appropriate for most ages.