Here's a list of the 238 I have come across currently.
I don't vouch for the quality, but the links work (usually).
NOTE: Since T is helluva tough, he ALWAYS wins. Any violations will not be posted, but exceptions can be made for good reason.

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W | X | Y | Z

Generic Mr.T vs Site :)
Mr.T vs A really Big Tree
Mr.T vs AC/DC
Mr.T vs AC/DC 2 sequel to above site (trailer)
Mr.T vs AC/DC (again)
Mr.T vs Airwolf
Mr.T vs Ali G
Mr.T vs Aliens vs Predator
Mr.T vs Anime
Mr.T vs the Annoying Pepsi Girl
Mr.T vs Anthrax
Mr.T vs Army of Darkness
Mr.T vs Ash from Evil Dead
Mr.T vs Austin Powers
Mr.T vs Australian Parliament
Mr.T vs Josh Ashworth Lead Singer of Society's Finest
Mr.T vs Back to the Future
Mr.T vs Bob Barker
Mr.T vs Barrett from FF7
Mr.T vs Battle.net
Mr.T vs Mr. Bean
Mr.T vs the Bears
Mr.T vs Ben Folds Five
Mr.T vs Beverly Hills Cop 3
Mr.T vs Osama bin Laden
Mr.T vs Bizarro T
Mr.T vs Tony Blair
Mr.T vs Tony Blair (again)
Mr.T vs Boba Fett
Mr.T vs James Bond
Mr.T vs John Wilkes Booth
Mr.T vs the Brady Bunch
Mr.T vs The Braves
Mr.T vs Garth Brooks (again) um...yeah...
Mr.T vs Mr. Burns
Mr.T vs George "Dubya" Bush
Mr.T vs C3P0
Mr.T vs Camelot Software
Mr.T vs Stephen J Canell
Mr.T vs Jim Carrey
Mr.T vs Carrot Top
Mr.T vs Fidel Castro
Mr.T vs CATS All your base are belong to T!
Mr.T vs Chewbacca
Mr.T vs Chibi Moon
Mr.T vs Chicken Lady Kids in the Hall, I think. Funny, yet disturbing.
Mr.T vs CHiPs
Mr.T vs Christian Evangelism
Mr.T vs CISCO
Mr.T vs Mr. Clean
Mr.T vs Clerks
Mr.T vs Clippit the MS Office paperclip
Mr.T vs the Confederacy
Mr.T vs Billy Corgan
Mr.T vs Cows
Mr.T vs Wesley Crusher
Mr.T vs the Cybermen
Mr.T vs Darth Maul
Mr.T vs Dawson's Creek
Mr.T vs Deep Blue
Mr.T vs Descent
Mr.T vs Dexter's Lab
Mr.T vs Dici-G this one is in Welsh
Mr.T vs Doctor Evil
Mr.T vs Don't Be A Menace
Mr.T vs Dragon Ball Z
Mr.T vs Dukes of Hazzard
Mr.T vs the Earth
Mr.T vs Elmo
Mr.T vs Eminem
Mr.T vs Eminem (again)
Mr.T vs Eminem (for the 3rd time)
Mr.T vs Ernest
Mr.T vs the Ewoks
Mr.T vs EvaPark a cross between South Park and Neon Genesis Evangelion
Mr.T vs Evil Dead
Mr.T vs Faelan
Mr.T vs Final Fantasy 7
Mr.T vs Mick Foley
Mr.T vs the Ford Focus
Mr.T vs FSO
Mr.T vs Fushigi Yuugi
Mr.T vs Gadaffi
Mr.T vs Galvatron aka Mr.T vs Megatron 3
Mr.T vs Ghostbusters
Mr.T vs Kathie Lee Gifford
Mr.T vs Crispin Glover
Mr.T vs Al Gore
Mr.T vs Gracie Jiu-Jitsu
Mr.T vs Gundam
Mr.T vs Gundam Wing
Mr.T vs GWAR
Mr.T vs Hackers
Mr.T vs Half-Life
Mr.T vs Hamlet
Mr.T vs Hannibal
Mr.T vs Heidi Not the classic story, but a creative person with a webcam
Mr.T vs Hellraiser
Mr.T vs He-Man
Mr.T vs His Evil Twin Senator Doctor Car
Mr.T vs His Own Abstract Thoughts
Mr.T vs Hitler
Mr.T vs T.J. Hooker
Mr.T vs Saddam Hussein
Mr.T vs Ice Cube
Mr.T vs the IMac
Mr.T vs the Incredible Hulk
Mr.T vs Steve Irwin (the Croc Hunter) - Site #300!
Mr.T vs Steve Irwin (again)
Mr.T vs Michael Jackson
Mr.T vs Jigglypuff
Mr.T vs Joe C
Mr.T vs Johnny Poindexter (a British band)
Mr.T vs Johnny Poindexter 2
Mr.T vs Angelina Jolie
Mr.T vs Indiana Jones
Mr.T vs Judge Dredd
Mr.T vs Kefka (from FFVI)
Mr.T vs Captain Kirk
Mr.T vs Kiss
Mr.T vs the Kool Aid Man
Mr.T vs KoRn
Mr.T vs Freddy Krueger
Mr.T vs Bruce Lee Site #200!
Mr.T vs the Leprechaun
Mr.T vs Lord of the Dance
Mr.T vs Norm MacDonald
Mr.T vs Macross 7
Mr.T vs Magic Knight Rayearth
Mr.T vs Magic: the Gathering
Mr.T vs Manic Street Preachers
Mr.T vs Mankind
Mr.T vs Marilyn Manson
Mr.T vs Ronald McDonald
Mr.T vs Ronald McDonald and Jason
Mr.T vs the Mask
Mr.T vs Megatron
Mr.T vs Metal Gear Solid
Mr.T vs Metallica
Mr.T vs Mickey Mouse
Mr.T vs Milkman Dan
Mr.T vs Monkey
Mr.T vs Mortal Kombat
Mr.T vs Scott Muller An Australian cricket player
Mr.T vs Mystery Science Theater 3000
Mr.T vs Need for Speed III
Mr.T vs Vince Neil
Mr.T vs Neon Genesis Evangelion
Mr.T vs Wayne Newton
Mr.T vs Nog
Mr.T vs NSync
Mr.T vs Shaquille O'Neal site #250!
Mr.T vs Shaquille O'Neal (again)
Mr.T vs Pantera
Mr.T vs the Phantom Menace
Mr.T vs Pikachu
Mr.T vs the Pillsbury Dough Boy
Mr.T vs Pimpbot 5000 Site #100!
Mr.T vs Pink Floyd
Mr.T vs Planet of the Apes
Mr.T vs Podracing aka Spiceworld 2
Mr.T vs Harry Potter aka Harry Potter and the Power of T
Mr.T vs Puff Daddy
Mr.T vs Quantum Leap
Mr.T vs Quark
Mr.T vs Queen Beryl
Mr.T vs R2-D2
Mr.T vs Red Dwarf
Mr.T vs Keanu Reeves
Mr.T vs Reservoir Dogs
Mr.T vs Resident Evil
Return of the Sucka Spiceworld Part 3
Mr.T vs Anne Robinson
Mr.T vs the Rock & Stone Cold Steve Austin
Mr.T vs the Rocky Horror Picture Show
Mr.T vs Mr. Rogers
Mr.T vs Ray Romano
Mr.T vs Sailor Moon
Mr.T vs Sailor Moon (again)
Mr.T vs Santa
Mr.T vs Saved by the Bell
Mr.T vs Seanbaby
Mr.T vs Sesame Street Sports
Mr.T vs Sgt. D
Mr.T vs the Shadows & Vorlons (from Babylon 5)
Mr.T vs Shakespeare
Mr.T vs Shaolin (part 1)
Mr.T vs Sifl & Olly
Mr.T vs Simon, Hecubus... Another Kids in the Hall
Mr.T vs O.J. Simpson
Mr.T vs Slayers Anime, not the band.
Mr.T vs Sliders
Mr.T vs Slipknot
Mr.T vs Smokey the Bear
Mr.T vs Han Solo
Mr.T vs Some Really Big Cans of Tea
Mr.T vs Space Ghost
Mr.T (and the world) vs Brittany Spears
Mr.T vs the Spice Girls
Mr.T vs the Spice Girls II
Mr.T vs Spiceworld
Mr.T vs Spiderman
Mr.T vs Steve Spurrier
Mr.T vs Star Blazers
Mr.T vs StarCraft
Mr.T vs Super Mario
Mr.T vs the Super Mario Brothers Super Show
Mr.T vs Survivor
Mr.T vs Survivor (again)
Mr.T vs Mr.T?
Mr.T2
Mr.T vs Team Fortress Classic
Mr.T vs Team Rocket
Mr.T vs the Terminator
Mr.T vs Titanic
Mr.T vs the Trade Federation
Mr.T vs Ted Turner
Mr.T vs Turok 2
Mr.T vs Shania Twain
Mr.T vs Mike Tyson
Mr.T vs the UK Garage Scene
Mr.T vs The Undertaker
Mr.T vs Unicron aka Mr.T vs Megatron 2
Mr.T vs V
Mr.T vs Jean Claude Van Damme
Mr.T vs Van Halen
Mr.T vs the Van Thief
Mr.T vs Vanilla Ice
Mr.T vs the Vision of Escaflowne
Mr.T vs Sela Ward
Mr.T vs John Wayne
Mr.T vs Weezer
Mr.T vs Wesker from Resident Evil
Mr.T vs the Winchester Gilbert & Sullivan Appreciation Society
Mr.T vs the World (literally)
Mr.T vs the X-Men
Mr.T vs the Yamo
Mr.T vs The Young Ones