To be honest, I'm not sure where I found this. It's been all over the place lately.
Bold if you've seen 3+ episodes. Bold and Italicize if you've seen every episode.
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The 4400
3-2-1 Contact
7th Heaven
A Different World
Absolutely Fabulous
Adam-12
The Addams Family
Aeon Flux
ALF
Alfred Hitchcock Presents
Alias
All-American Girl
Allo Allo
Ally McBeal
The Amazing Race
America Gothic
American Idol/Pop Idol/Canadian Idol/Australian Idol
America's Next Top Model/Germany's Next Top Model
The Andy Griffith Show
Angel
Angie
Aqua Teen Hunger Force
Are You Afraid of the Dark?
Arrested Development
The A-Team
Avatar: The Last Airbender
The Avengers (Old Series)
Baa Baa Black Sheep
Babylon 5
Babylon 5: Crusade
Banana Splits Show
Barnaby Jones
Battlestar Galactica (the new one)
Battlestar Galactica (the old one)
Baywatch
Beavis & Butthead
The Beverly Hillbillies
Beverly Hills 90210
Bewitched
Big Love
Bionic Woman
Blackadder
Bonanza
Bones
The Book of Daniel
Bosom Buddies
Boston Legal
Boy Meets World
The Brady Bunch
Buffy the Vampire Slayer
Bug Juice
Captain Planet
Captain Simian and the Space Monkeys
Carnivale
Chappelle's Show
Charlie's Angels
Charmed
Cheers
Clone High
Columbo
The Comeback
Commander in Chief
Connections
The Cosby Show
Cosmos
Coupling (UK version)
Cowboy Bebop
Crossing Jordan
CSI
CSI: Miami
CSI: NY
Curb Your Enthusiasm
The Daily Show
Dallas
Dancing with the Stars
Danny Phantom
Dark Angel
Dark Shadows 1990
Dark Shadows (original soap opera)
Dark Skies
Davinci's Inquest
Dawson's Creek
Dead Like Me
The Dead Zone
Deadliest Catch
Deadwood
Degrassi: The Next Generation
Designing Women
Desperate Housewives
Dharma & Greg
The Dick Van Dyke Show
Diff'rent Strokes
Doctor Who (new Who)
Doctor Who (original)
Dr. 90210
Dragnet
Duck Tales
Due South
Earth 2
Eerie, Indiana
Emergency!
Empty Nest
Entourage
Equalizer
ER
Everwood
Everybody Loves Raymond
Facts of Life
Family Guy
Family Matters
Family Ties
Fantasy Island (New Series)
Fantasy Island (Old Series)
Farscape
Fat Actress
Father Knows Best
Fawlty Towers
Felicity
Firefly
The Flintstones
Footballers' Wives
Frasier
Freaks & Geeks
The Fresh Prince of Bel-Air
Friends
Full House
Futurama
Get Smart
Ghost Hunters
Gilligan's Island
Gilmore Girls
Globe Trekker
Glory Daze
The Golden Girls
Gomer Pyle, U.S.M.C.
Green Acres
Green Wing
Grey's Anatomy
Growing Pains
Gundam Wing
Gunsmoke
Happy Days
Harsh Realm
Hart to Hart
Harvey Birdman: Attorney at Law
Head of the Class
Hell's Kitchen
Heroes
The Hogan Family
Hogan's Heroes
Home Improvement
Homicide: Life on the Street
The Honeymooners
House
I Dream of Jeannie
I Love Lucy
InuYasha
Invader Zim
Invasion
Iron Chef
Iron Chef America
Jackass
JAG
The Jeffersons
Jericho
The Jetsons
Joey
John Doe
Just the 10 of Us
Justice League/Justice League Unlimited
Kate & Allie
Kath and Kim
Keen Eddy
Kim Possible
Knight Rider
Knot's Landing
The L Word
LA Law
Land of the Lost
Laverne and Shirley
Law & Order
Law & Order :CI
Law & Order: SVU
Life As We Know It
Life on Mars (UK)
Little House on the Prairie
Lizzie McGuire
Lois and Clark: The New Adventures of Superman
Lost
Lost in Space
The Love Boat
Love, American Style
M*A*S*H*
M.A.N.T.I.S
MacGyver
Magnum P.I.
Major Dad
Malcolm in the Middle
Mama's Family
Married... With Children
The Mary Tyler Moore Show
Medium
Melrose Place
Miami Vice
The Mighty Boosh
Millenium
Misfits of Science
Mission: Impossible
Monk
The Monkees
Moonlighting
Mork & Mindy
Mr. Show with Bob and David
The Munsters
Murder She Wrote
Murphy Brown
My Family
My Life as a Dog
My Name is Earl
My Secret Identity
My So-Called Life
My Three Sons
My Two Dads
Mystery Science Theater 3000
The Mythbusters
NCIS
The New Adventures of Wonder Woman
Night Court
Nip/Tuck
Northern Exposure
Nova
Numb3rs
Nurses
The O.C.
The Office (UK)
The Office (US)
One Tree Hill
Out of This World
Oz
Parker Lewis Can't Lose
The Partridge Family
Perry Mason
Picket Fences
Playmakers
Point Pleasant
Pokemon
Popular
Power Rangers
Pretender
The Prisoner
Prison Break
Profiler
Profit
Project Runway
Psych
Quantum Leap
Queer as Folk (British)
Queer As Folk (US)
The Real World
ReGenesis
Remington Steele
Reno 911
Rescue Me
Road Rules
ROME
Roseanne
Roswell
Saved by the Bell
Scarecrow and Mrs. King
Scooby-Doo, Where Are You?
Scrubs
Seinfeld
Sex and the City
The Shield
Simon & Simon
The Simpsons
Six Feet Under
The Six Million Dollar Man
Slings and Arrows
Smallville
So Weird
So You Think You Can Dance
Soap
The Sopranos
South Park
Space Ghost
Space Ghost: Coast to Coast
Space: 1999
Spaced
Spongebob Squarepants
Sports Night
Stark Raving Mad
Star Trek: The Original Series
Star Trek: The Next Generation
Star Trek: Deep Space Nine
Star Trek: Voyager
Star Trek: Enterprise
Stargate Atlantis
Stargate SG-1
Starsky & Hutch
Step By Step
Strange Luck
Strangers with Candy
The Suite Life of Zack and Cody
Superman
Supernatural
Surface
Survivor
SWAT
Taxi
Teen Titans
That 70's Show
That's So Raven
Third Watch
Three's Company
Thundercats
The Tomorrow People
Top Gear
Torchwood - UK
Tru Calling
The Twilight Zone
Twin Peaks
Twitch City
UFO
Ugly Betty
Unscripted
V
Venture Brothers
Veronica Mars
The Waltons
Wasteland
Weeds
Weird Science
The West Wing
Wizards And Warriors
Whose Line is it Anyway? (UK)
Whose Line is it Anyway? (US)
Who's the Boss?
Will and Grace
Wings
The Wonder Years
Wonderfalls
The X-Files
X-Men: Evolution