I guess the three big ones would be
Here's a list of other albums I know inside and out from pretty much playing to death. A few of these albums I haven't listened to in years and probably won't any time soon.
Iron Maiden - Powerslave & Piece Of Mind
Pink Floyd - Dark Side Of The Moon
The Smashing Pumpkins - everything else
The Cure - Pornography
Metallica - Master Of Puppets & Ride The Lightning
Pearl Jam - Ten
Radiohead - OK Computer
Sonic Youth - Daydream Nation
Nirvana - Nevermind
The Stone Roses - The Stone Roses
The Replacements - Let It Be
Slowdive - Souvlaki
AFI - Sing The Sorrow
Funeral For A Friend - Casually Dressed And Deep In Conversation
Alice In Chains - Dirt
Queens Of The Stone Age - Songs For The Deaf
The Smiths - The Queen Is Dead
At The Drive-In - Relationship Of Command
Placebo - Without You I'm Nothing
Belle and Sebastian - The Boy With The Arab Strap