I went around the net and collected some links for you ...
http://www.childalert.co.uk/absolutenm/ ... 8&zoneid=1
http://www.enquirer.com/editions/1999/1 ... s_big.html
http://www.spiked-online.com/index.php? ... icle/1287/
IMHO - as long as kids are "balanced" - e.g. good diet, has interaction with other children on a regular basis, having healthy amounts of exercise - kids who are sometimes exposed unsuitable media on TV is less likely to "stick" and influence their development.
There is also a huge differance between 1 hour a day watching TV and 6 hours a day.