Here it goes:
Mallrats
Clerks
Super Troopers
Office Space
Baseketball
Soutpark: Bigger Longer and Uncut
Deadman on Campus
Jackass The Movie
Freddy Got Fingered
Jay and Silent Bob Strike Back
Dogma
Dont Be A Menace In South Central While Drinkin The Juice In The Hood
Road Trip
Idle Hands
Detroit Rock City
Van Wilder
Dumb and Dumber
thats all i can think of right now...and thats just comedy

Con Air
The Rock
Revenge of the Nerds!!!
Memento..

many others which i cannot think of atm.

the Princess Bride
Wuthering Heights (1992 version with Juliette Binoche and Ralph Fiennes)
High Fidelity
Labyrinth
Shawshank Redemption
French Kiss

And not a movie, but I have 5 seasons of Buffy and 2 seasons of Angel on DVD, and I always end up watching at least five or six episodes in a row every week or two.

Pulp Fiction
The Big Lebowski
Saving Private Ryan

Lord of the Rings: Fellowship of the Ring and Two Towers
Spaceballs
Star Wars
Saving Ryan's Privates
Pirates of the Carribean
The Rock
Revenge of the Nerds
Ghostbusters
Ice Age
Mallrats
Dumb and Dumber

The Hunt For Red October
Mallrats
Indian Jones series

cool i'm not the only one who has Dumb And Dumber on the first spot in my list :-)

other than that, I watch a lot of Jim Carrey films again and again...

offcourse the classics:

pulp fiction
spiderman
reservoir dogs
kill bill
and not to forget the lotr triology :-)

AIRPLANE!
Office Space
Forrest Gump (ha)
Boogie Nights
Ghostbusters 1 & 2
Road Trip
and many more!

Return of the Jedi
Indiana Jones and the last Crusade
Hook
Office Space
Princess Bride
Waiting for Guffman
One Flew Over The Cuckoo's Nest
Goonies!
Boondock Saints (can't wait for the sequel...:D)
Moulin Rouge
Forrest Gump
The list goes on and on...

the only movie I can watch day after day after day and for some reason don't get annoyed with it is Ocean's Eleven. Don't get me wrong, I have other super-favorites, but Ocean's Eleven for some reason has that aura of "repeat viewing" going on.

Excalibur

"You're above the law, you're King!"
"Noone is above the law! Especially the King."

Fucking sweet.

Office Space
City Slickers
Unforgiven
Crouching Tiger Hidden Dragon
Ghost Dog
Total Recall
Mulholland Drive
Magnolia
all of David Mamet's films

Fight Club - only movie ever to change how I think
Full Metal Jacket - best war movie ever
Rocky I-V - gotta love boxing
Rambo I-III - my hero
also on the list: Van Wilder, Caddyshack, Dumb & Dumber, BASEketball, Animal House, Remember the Titans, The Shining (REDRUM)

THE JACKSONS: AN AMERICAN DREAM
The Original Kings of Comedy
Good Will Hunting
The Count of Monte Cristo
Rudy
Simon Birch
X-Men 2
Bad Boys (I & II)
A Low Down Dirty Shame
The Italian Job

give starfish a gold star!!!

only other person that put down ferris bueller's day off!
man i love that movie

Dogma
Boondock Saints
Friday
Super troopers
and of course Office Space

Office Space!!

Tombstone

never ever tired of those :p

My favorite is "Electric Dreams" with Virginia Madsen and Lenny Von Dohlen. Made in 1984. Bought a guy who buys a home computer and downloads eveerything from the office mainframe. Then has to fight the computer over the girl upstairs. It was kind of corny but I still liked it.
Second best is all the Jurrasic Park films

Well i cant watch many movies often
But ones i enjoy on many occasions are:

Kiss of the Dragon
Oceans 11
Romeo Must Die

Yes im a Jet Li fan :)

The Pixar moves, The Rock, Executive Decision, Gone In 60 Seconds, The Fugitive, etc.. Can't think of anymore off the top of my head right now. But I'm sure that there are a couple more.

Star Wars, Empire and Jedi
It's A Wonderful Life
2001
Platoon
Clockwork Orange
Resevoir Dogs
Pulp Fiction
Evil Dead, Evil Dead 2 and Army of Darkness
Shawshank Redemption

almost forgot
Clerks
Chasing Amy