Sorry I have to include other media...
Lost Horizon Oh when he leaves Shangri La....
Milton Paradise Lost (same thing, really)
The Pearl Fisher's Duet Bizet
The Pilgrim's Progress Radio version by Vaughan Williams, Bunyan's text, John Gielgud at the heartstrings
My Mother's Castle Both the film and the book
The Wizard of Oz Doggy, weeping Judy Garland...oh dear
The Incredible Journey I saw it when I was 7 and I will never put myself through it again
Di's funeral And I didnt care 2 hoots for her
Dr Zhivago
Canteloube, Songs of the Auvergne, "The Forsaken Girl"
Awww.....
Puccini Madama Butterfly and of course...the end of La Boheme !

I just watched the Godfather part 3. Just taking the scene alone, the expression of pain on the Godfathers face when his daughter got shot I found most moving.

although I havent watched it in years, the one that caused me to go through a half box of tissues was the elephant man, "I am not an animal"

And of course the Green Mile.. keep thinking the more I see it the less i will cry... That does not work,

But a good cry is very healthy so I will just keep watching all the tear jerkers i want, so there. lol

Jeez, quigley, why didn't you mention that Quantum Leap episode you keep bringing up, which I don't think I ever saw? Sam leaps into Al, and Al wants Sam to tell his wife to wait for him, since he's going to be a POW, and Sam won't do it?

As for me, a few I didn't see mentioned- Babylon 5, when Marcus gives his life to save Ivanova, and there was a Deep Space 9 episode where Jake is an old man, telling his life story to an intern or something. Sisco disappeared a long time ago in an accident, and keeps showing up to Jake every few years, but Benjamin doesn't experience the passage of time. Jake dedicates his life to saving his father, ruins his marriage, etc. As it turned out, Ben finally appears, and Jake tells him the only way to save him was to kill himself. So, there is a scene with Ben holding his son, as an old man, crying... and that reverses everything. DS9 was probably the most well written of all the ST incarnations.

In sitcoms, what about those 'very special' episodes, like on Family Ties when Alex's best friend dies(a guy we had never seen!) and Alex goes a little crazy? That got to me a bit.

Aww, that Quantum Leap episode makes me cry every time I see it. Sam didn't leap into Al, Al just lied to Sam about what the mission was, he told him he was supposed to tell Beth to wait for her POW husband. In the last episode Sam did go to Beth and tell her to wait, then they tell you that Al and Beth lived hapily ever after and had four children, all girls. That one makes me cry too.

I must agree with MollyGrue about the E.R episode where Dr.Green dies.
This is somewhat embarrassing to admit, but the episode of Ally McBeal where Billy died had me bawling. I also cried on the final episode. Don't ask me why. I don't know.

The death scene in "Sayonara," when Marlon Brando discovers the bodies of his buddy and his Japanese lover after they committd suicide (at that time, the U.S. government prohibited marriages between U.S. service men and Japanese citizens).

The final scene in "The King and I."

Melanie's death in "Gone With the Wind."

The final scene in "Carousel," when Billy returns to earth as an angel to tell his wife and daughter how much he loved them, while "You'll Never Walk Alone" is sung in the background.

Oh geez, I cry over everything! I guess I just have more tears than most people and if I didn't cry all the time I would drown.
But the most memorable tear-jerkers have been "Edward Scissorhands", "Powder", "The River" (I think the scene with the poor little deer or some other Bambi-like animal wandering around in the factory or mine or whatever it was is one of the most touching ones in film history), "Leon", "Magnolia" and tons and tons of others.

Here are my most memorable ones...

Tarka the Otter - Cannot to this day sit through that film, I did it once and cried so much I thought I would dehydrate, now I flat out refuse to watch it.

Pay it Forward - The candlelight vigil, I do great until I get to that part.

The Sixth Sense - When he tells his mom in the car he talked to her mother, oh boy.

Beaches - Pretty much the entire latter half of the movie.

The Green Mile - When Percy stamps on Mr Jingles among other scenes.

Notre-Dame de Paris - Ok, it's a musical but wow, when Quasimodo sings Dieu que le monde est injuste and Danse Mon Esmeralda, I'm balling for sure (pretty embarassing in a theatre too), thank heavens I now have the DVD and can sob unrestrained.

Ghost - who didn't cry?

Philedelphia - At the end, that one got me in the cinema too, now I avoid going to see movies that I think will make me cry, I wait for the video to come out.

I'm sure there are many more, but those are the ones that come to mind right now