Memento (2000)

Playboy Video Centerfold: Playmate of the Year Dalene Kurtis (2002)
The boyfriend charater in chapter 3 got the same short tem memory lost from a car accident. Polaroid photos and hand written text is used to help recollect forgotten events.

Irreversible (2002)

Home Movies: My Cheatin' Heart (2002)
Mentioned in dialogue

A Decade Under the Influence (2003)

Watching the Alien (2003)
mentioned once

Finding Nemo (2003)
Dory has the same short-term memory problem as Memento's main character.

The Memory of a Killer (2003)
Character writes clues on his body because he keeps forgetting everything (he has the disease of Alzheimer)

Kill.switch (2003)

High Chaparall: Robert Englund (2004)
You can see this movie in Robert Englunds DVD collection

Film Geek (2005)
customers hate this 'confusing' movie

American Dad!: Pilot (2005)
Stan says "Did you see Memento? It's not as good the second time."

Stephen Tobolowsky's Birthday Party (2005)
Referenced by Greg Wagnowsky

Ghajini (2005)
The plot of this film is very similar to that of Memento(2000). Both are about a man with short term memory loss who tattoos events onto his body and keeps a journal who is looking for his lover's killer.

Film Noir: Bringing Darkness to Light (2006)
Mentioned once.

Video Kings (2007)
They talking about the Movie.

Saturday Night Live: Scarlett Johansson/Björk (2007)
Mentioned on Weekend Update

The Darkness (2007)
Jackie has tattoo on his neck that reads simply "memento." In 'Memento' Leonard records vital information by tattooing it on his body.

Stargate: Atlantis: Tabula Rasa (2007)
Themes of memory loss and the use of notes on the body and polaroid photos in order to remember important information.

Fazendo as regras (2008)
Mentioned

Ghajini (2008)
Entire theme of short term memory loss, how the protagonist keeps memory using tattoos and Polaroid pics

Who Wants to Be a Millionaire: Million Dollar Movie Week 3 (2009)
Subject of a $4,000 question

One Minutes (2009)
The section Phone Call in One Minutes runs the series of events backwards as a reference to Memento.

Vengeance (2009)
Word references on the pictures and on Costello's gun

Proinhibition (2009)
The film takes the jumbled, out-of-sequence view point of its deranged main character.

Weeds: Ducks and Tigers (2009)
mentioned by Doug

The Big Fat Quiz of the Year (2010)
Referenced by name

Who Wants to Be a Millionaire: Million Dollar Movie Week 1 (2010)
Included in a $10,000 question

Richard Roeper & the Movies: Inception (2010)
Listed as a movie directed by Christopher Nolan

IMDb's 20th Anniversary Star of the Day: Jennifer Todd (2010)
Jennifer Todd mentions this movie during interview

The North Pole Deception (2010)
Quoted dialogue: "Always get a receipt"

Supernatural: Like a Virgin (2011)
mentioned by Bobby

Supernatural: Unforgiven (2011)
mentioned by Dean

Weeds: Object Impermanence (2011)
mentioned by Heylia

Forget About It: Inception (2011)
Panda mentions Nolan directing "Memento"

Tosh.0: Surfer Fail (2011)
Mentioned in dialogue

Bored to Death: The Blonde in the Woods (2011)
When Steven points out to George that he keeps getting his name wrong, George says to him, "I am so sorry, Steven. Because of the marijuana, my whole life is like that film, Memento."

The Nostalgia Critic: Thomas and the Magic Railroad (2012)
"Since when was this a kid version of Memento?"