Private Practice docs are giving free check-ups to homeless teens… 30 Rock’s Kenneth is volunteering at an animal shelter… The Ghost Whisperer is helping out at a blood drive… The Brothers bros are coaching high school football… It’s all part of something called “Tune-In Week” as the major networks support the Entertainment Industry Initiative’s iParticipate initiative meant to inspire television viewers to volunteer. More than 100 shows — morning through late night — will emphasize volunteering this week. Viewers at home can log onto www.iParticipate.org to find a volunteer opportunity in their neighborhood. And Hollywood will be volunteering as well today through Saturday as the networks, studios, and major agencies join together to do volunteer projects throughout LA. Yes, even the tenpercenters have been enlisted for tasks like making care packages for soldiers, cleaning beaches, working at the LA food bank, and teaching art to kids.