"There Goes My Life"-Kenny Chesney
"At 17"- Janis Ian

Live Like You We're Dying - Tim McGraw

This Is Goodbye - Rascal Flatts

Norah Jones - Come Away With Me. It kept playing over and over in the hospital as my friend's 6-year-old was dying. It haunts me.

From Where You Are by Lifehouse's Jason Wade:
http://www.youtube.com/watch?v=TG4zXE0_7yA

Anyone here (besides me) ever hear the song "From Where You Are" by Jason Wade, Lead singer & Songwriter from Lifehouse. In the video you see a caravan of cars with teenagers in it. The song was written to remember all the lteenagers who have lost their lives behind the wheel, but to me it is a song that recognizes the lives of those lost too soon, no matter how long that person lived or how that person died before their time.

Agree with quite a few already mentioned:

Most anything by Harry Chapin (Cat's in the Cradle, A Better Place to Be, Corey's Coming, Taxi, etc)
Suicide is Painless

Adding:
You and Me Against the World
Many years ago, when my aunt was pregnant with my cousin, my uncle was a diplomat stationed in Tokyo. My cousin was a blue baby, born with a hole between two chambers of his heart. My aunt went into labor and delivered the baby while my uncle was unavailable due to a diplomatic meeting that he needed to be at (50 years ago, no cell phone, so he didn't even hear she went into labor). My cousin was born and immediately went into the NICU. The problem is that while my uncle was bilingual and spoke Japanese, my aunt did not and so she was in the hospital with a child in the NICU and couldn't communicate well with the medical staff. At one point she visited my cousin in the NICU and she heard this song on the radio and she broke down. It became their song because she really felt that way about the two of them. Later, my uncle arrived and things got better, but for several hours, she was beside herself. He's fine and healthy 50 years later, but I can't hear this song without hearing my aunt tell this story (although my aunt passed away some years ago).

Somewhere from West Side Story (first musical I ever saw, first one I ever performed in and Tony's death still gets me)

I'm a sucker for sentimental crap in general.

Gaelic Blessing by John Rutter

Wow, I forgot about Riding with Pvt. Malone. That brings it every time.

Agree on several already posted:

Kathy Mattea: Where've you been? and Baby Mine: Mrs. Jumbo

Two more: Riding with Private Malone

http://www.youtube.com/watch?v=v5dyHPX8Cos

and Sheryl Crow: Lullaby for Wyatt (the version that uses famous paintings of children)

Creep - Radiohead

Look what you've done - Jet

The theme from The Hulk (old 70s show with Bill Bixby).

I'm not kidding.

Don't Follow --Alice in Chains
Lightning Crashes -- Live

Danny Boy.

Ever since it was played at my grandfather's funeral I bawl every single time. I never even realized it was his favorite song and that his mother sang it to him until shortly before his funeral.

With or without you - U2
More than words - Extreme
To wish impossible things - the cure

Oh Lord, You're Beautiful by Keith Green

I can remember my father singing it when I was a kid and it was one of the songs played at his funeral.