LDS.org: General Conference Talks on Gratitude
LDS.org: Resources on the Gospel Topic of "Gratitude"
LDS.org: Resources for teaching Children about Gratitude
LDS.org: The Guide to the Scriptures on the topic of Gratitude
BYU: Encyclopedia of Mormomism: "Thankfulness"
LDS.org: Top Search Results on the topics of Gratitude and Thankfulness
Be Thankful (for what you don't have)
Expressing appreciation to others - President Gordon B. Hinckley
Expressing Gratitude - short story told by Pres. Thomas S. Monson
"Live in Thanksgiving Daily" - Joseph B. Wirthlin - Ensign
Teaching Ideas for a lesson (by a Seminary teacher)
Thank You, Lord
"The Glory of an Ordinary Day" - The Spoken Word
The Sister Who Served
"Think About This...."
Count Your Blessings
Drink from the Saucer
"Gratitude" - by Edgar Guest
"Thank God For Dirty Dishes..."
"The Most Beautiful Flower"
"Through Someone Else's Eyes"
Quotes - 1
Quotes - 2
Quotes - 3
Quotes on Thanksgiving (Daily WOOL)
Scriptures on Gratitude
"Think to Thank" - President Thomas S. Monson
"Gratitude" - Elder Gordon T. Watts
"Gratitude and Thanksgiving" - Marion G. Romney
"Gratitude as a Saving Principle" - James E. Faust
"Remembrance and Gratitude" - Henry B. Eyring
"And in Everything Give Thanks" - Marvin J. Ashton - Fireside
"Listen, Lift, Rescue"
"Live in Thanksgiving Daily" - Joseph B. Wirthlin
"Through the lens of Gratitude" - BYU-Idaho
FHE on Gratitude (mormonmomma.com)
"Grateful Heart" short excerpt by James E. Faust - Friend Mag.
"I'm Thankful for You" - Ensign (Random Sampler, scroll down)