Yet another one in no particular order. 
Restricting it to one appearance per artist.
Electric Light Orchestra - Face the Music
The Beatles - Sgt. Pepper’s Lonely Hearts Club Band
Traveling Wilburys - Traveling Wilburys, Vol. 1
Yes - The Yes Album
U2 - The Joshua Tree
Roy Orbison - Mystery Girl
Queen - A Night at the Opera
Toto - Toto
Tom Petty - Full Moon Fever
Melissa Etheridge - Melissa Etheridge
I gotta say, of all the bands I expected to see on this list, the Negro Problem was nowhere near my radar. Props to the dude who put Belly on their list as well (Boston!)
I was also adhering to the one-album-per-band rule (otherwise Loveless probably would have been on there too), and furthermore I realized that I made some glaring omissions that, rather than revise the whole list, I’ll just drop into the honorable mentions category:
Blur - The Great Escape
The Dead Texan - The Dead Texan
Brian McBride - How the Detail Lost Its Freedom
Men & Volts - Tramps in Bloom (anyone who remembers this band is entitled to a lifetime of my love and affection)
Archers of Loaf - Icky Mettle
bis - This Is Teen-C Power! or Return to Central (I can never decide)
Not in any particular order:
SLANG–Def Leppard
SURREAL–Man/Raze
MOMENTARY LAPSE OF REASON-Pink Floyd
PRETTY HATE MACHINE-Nine Inch Nails
LOAD-Metallica
HEY STOOPID-Alice Cooper
TEST FOR ECHO–Rush
PSYCHOTIC SUPPER-Tesla
OUT OF THE BLUE-Electric Light Orchestra
TATTOOS AND ALIBIS-Ricky Warwick
Wilco - “Yankee Hotel Foxtrot”
Richard Thompson - “Mock Tudor”
Camel - “The Snow Goose”
U2 - “The Joshua Tree”
Genesis - “Seconds Out”
Rush - “Moving Pictures”
The Who - “Who’s Next”
Wishbone Ash - “Argus”
Old 97’s - “Too Far To Care”
Zappa - “Zoot Allures”
Hard to pick just 10. And I didn’t put any Beatles or Zeppelin on the list because I honestly don’t know which one I would pick.
Mock Tudor- Richard Thompson
Decoration Day- The Drive-By Truckers
What I Deserve- Kelly Willis
The Hardest Part- Allison Moorer
In The Aeroplane Over The Sea- Neutral Milk Hotel
Metallica(The Black Album)- Metallica
Ten- Pearl Jam
Appetite For Destruction- Guns’N’Roses
The Beatles(The White Album)- The Beatles
Thriller- Michael Jackson
Aha! Another ELO fan! 
You betcha
Everything the Doors ever did (hence my username)- I know, I cheated already…
Pantera- Vulgar Display of Power
Living Colour- Time’s Up
REM- New Adventures In Hi-Fi
Smashing Pumpkins- Siamese Dream
Nirvana- Nevermind
Alice In Chains- Dirt
Soundgarden- Badmotorfinger
Nine Inch Nails- The Downward Spiral
The Beatles- Sgt. Pepper’s Lonely Hearts Club Band
Other than The Beatles and Doors, which are timeless, it isn’t hard to guess when I grew up, is it?
Today? In no particular order:
Beatles - Abbey Road
U2 - Joshua Tree
Moby - Play
The Who - Who’s Next
The Chemical Brothers - Come With Us
Peter Gabriel - Passion (Last Temptation of Christ)
Portishead - Dummy
Queen - Night at the Opera
Shpongle - Tales of the Inexpressible
Pink Floyd - Wish You Were Here
Tomorrow, it will probably be a different list.
Really hard to come up with an “all time” list. A lot of albums that I loved 10 years ago I hardly listen to these days. I guess these are the ones that hold up the best:
Nirvana - MTV Unplugged in New York
Pink Floyd - The Dark Side of the Moon
Camera Obscura - Let’s Get Out of This Country
Björk - Homogenic
Yeah Yeah Yeahs - Fever to Tell
Tool - Lateralus
Norah Jones - Come Away With Me
L7 - Bricks Are Heavy
Tegan and Sara - The Con
Ladytron - Witching Hour
Where’s your Red Hot Chili Peppers’ Blood Sugar Sex Magik? 
(Seriously, that’s an album that almost made my list.)
And thanks to the OP for noticing my inclusion of the Negro Problem. Stew can be brilliant – almost Cole Porter-esque at times. I caught his show on Broadway, and I thought it was terrific.
The list this month of albums in heavy rotation at the gazpacho family seat.
Pink Floyd - Wish You Were Here (Every time I listen to this I think just how damn good it is)
Rossini - The Barber of Seville (probably not in the spirit of the thread but too bad. Like the previous entry every time I listen to it I think it is the best piece of music every written)
The Clash - London Calling
U2 - Actung Baby
Led Zeppelin - 4
Green Day - 21st Century Breakdown (This is currently more favored than American Idiot)
The Fratellis - Costello Music (The goto album for workouts)
Flogging Molly - Float
Jimmy Cliff - The harder They Come ( Movie sound track with other bands beside Jimmy Cliff, The movie is not very good)
The Doors - The Doors.
In no order:
Rubber Soul - The Beatles
Surrealistic Pillow - Jefferson Airplane
Ladies of the Canyon - Joni Mitchell
Hangman’s Beautiful Daughter - The Incredible String Band
Living With Ghosts - Patty Griffin
Highway 61 Revisited - Bob Dylan
Benefit - Jethro Tull
Essential Leonard Cohen - Leonard Cohen
Wee Tam/Big Huge - The Incredible String Band
It’s a Beautiful Day - It’s a Beautiful Day
:smack:
I want to add ELO - “A New World Record” to my list now. Great album!
The minute I post this I’m going to think, “Wait! I forgot about…” These aren’t in order of preference, BUT…
Leon Russell----Asylum Choir II (ALL of his albums, but this one has “Ballad to a Soldier” which jump-starts my heart everyday
Todd Rundgren----Something/Anything
Melissa Manchester-----Home to Myself
Bette Midler-----The Divine Miss M
Simon & Garfunkel----Bookends
Art Garfunkel------Breakaway
Bobby Gentry-----Ode to Billie Joe
Cosby, Stills & Nash (& Young)
The Beatles-----Meet the Beatles
O Brother Where Art Thou—Down From the Mountain
But my favorite song of all time (so far) is Eric Clapton’s “If I Could Change the World”
Of course, all the Beatles albums. But Meet the Beatles is when I met the Beatles and my heart went boom…lol
Townes van Zandt…Yeah!
In order:
No Peter Gabriel (other than the 2 Genesis albums) but he would be all over choices 11-20.
… In no particular order. 
To get this down to 10 I had to impose an additional rule - I only included the ten albums I would be most likely to listen to from start to finish. No skipping tracks allowed.
So, in no particular order:
X-Los Angeles
Wilco-Yankee Hotel Foxtrot
Talking Heads-Fear of Music
Bob Dylan-Modern Times
Replacements-Hootenanny
REM-Life’s Rich Pagent
Pretenders-Pretenders
Mission of Burma-Vs
Gang of Four-Entertainment
David Bowie- Ziggy Stardust
BTW, this list is only valid for today.