I'm guessing my musical taste is REALLY different from y'all but...
AstroCreep 2000 by White Zombie
Operation MindCrime by Queensryche...I always wanted to be Dr. X though
AstroCreep was a damn fine album, and the full track names are just absolutely adorable.
For instance, one of my favorites, "El Phantasmo and the Chicken-Run Blast-o-Rama"
Also, Operation Mindcrime is one of the best concept albums there is. Listening to it from beginning to end is the just the same as watching a movie.
However, my vote for Greatest Album of all time...

Nine Inch Nails
The Downward Spiral
Everyone has their story of the album that changed their lives. This album changed mine. I was a lost, lonely, isolated teenager and then I saw the video for "closer" one night on Mtv. Something clicked. Even then I was able to look past the lyrics. I was far more focused on Mark Romaneks' visuals and the musical construction of the song. Something in it spoke to me, and it wasn't just the words "I wanna..." You know...
This album, often listened to using the best pair of headphones in the house, volume cranked up to the limits of my hearing, alone in my room in pitch black, was how I survived High School.
Since other people are nominating more than one album, I guess I shall as well..
Number two goes too..

Skinny Puppy
Greater Wrong of the Right
After a much-too-long string of silence, and many Side/Solo projects later, Skinny Puppy reunites to prove that they are still the masters of a Genre that they helped create. This album holds a very special place in my heart, but looking at the selections the rest of you have made, I don't think many of you will fully understand why, let alone agree.