Wow, most of mine have already been mentioned.
Rayne- If your'e a looser for crying for The Velveteen Rabbit, then we both are.
Also, LD, Where the Red Fern Grows... Traumatized me for life.
Bridge to Terabithia was always a favorite of mine when I was younger... Resulted in many tears.
And, please, no laughing, but if memory serves, I think that I may have shed a tear or two for The Other Side of Midnight.
~Kindred