This just released report (April 2007) seems to agree with many of the findings of the Dec. 2006 Kaiser findings.
December 12, 2006
New Study and Forum on Implications of Youth Media Multitasking
The Kaiser Family Foundation hosted a forum and released a new report on media multitasking among young people. The report, Media Multitasking Among American Youth: Prevalence, Pairings and Predictors, is based on data from seven-day media use diaries collected from 694 young people age 8 to 18 years old and quantifies the actual amount of time young people spend multitasking when using media or doing homework.
News coverage of the new study:
Media Multitasking Among Youth
More Media, More of the Time
Report sparks debate on kids and multi-tasking
Kaiser Family Foundation: Multitasker Focus On TV