Rah, I think ya right -- Illidelphi Halflife did a lil' sumthin' to me...

couple of joints i didn't see up there...

enta da stage - black moon (woo lawd)
illadelph halflife - roots (best work by Black Thought in my opinion)
midnight marauders - tribe (all of the first three albums are classics, but this one is like the perfect hybrid of Instinctive travels and low end)
musically, the Chronic is incredible, and can't forget Doggystyle, always one of my favs besides just about everything else folks mentioned previously.

BDP - Criminal Minded

man that's tough...

I could be mistaken but I didn't see anyone mention The Roots "Do Ya Want More"

That was a life changer for me! ;-)

****... That's a hard question...

My list doesn't really include anything that didn's appear already but it is a listing of, chronologically, the albums that have changed my headspace and made me believe that the revolution hasn't even started yet...

Run DMC - Raising **** (1986)
Public Enemy - It Takes a Nation Of Millions to Hold Us Back (1988)
Critical Beatdown - Ultramagnetic MC's (1988)
3 Feet High and Rising - De La Soul (1989)
People's Instinctive Travels - A Tribe Called Quest (1990)
Bizarre Ride II - The Pharcyde (1992)
Southernplayalisticadillacmuzik - Outkast (1994)
Illmatic - Nas (1994)
Ready to Die - Notorious B.I.G. (1994)
Livin Proof - Group Home (1995)
I Got Next - KRS One (1997)
Black on Both Sides - Mos Def (1999)
Things Fall Apart - The Roots (1999)
Brand New Second Hand - Roots Manuva (1999)
Like Water For Chocolate - Common (2000)

...and I haven't even scratched the surface...

Digable Planets - Reachin' (A New Refutation of Time and Space)

Black Star - Mos Def & Talib Kweli are Black Star

Nas - Illmatic

Asheru & Blue Black of the Unspoken Heard - Soon Come

Common - Resurection, One Day It'll All Make Sense, Like Water For Chocolate, Electric Circus

A Tribe Called Quest - The Low End Theory, Midnight Marauders

I definitely gotta add
Redman-Whut!The Album??!!
and
EPMD-Business As Usual

Gotta say in my opinion as far as classics:

Pete Rock & C.L.-Mecca & The Soul Brother
Biggie-Ready To Die
Public Enemy-Fear of a Black Planet
K.M.D-Mr. Hood
A Tribe Called Quest-Midnight Marauders
Dr. Dre-The Chronic
Eric B. & Rakim-Paid In Full
Mos Def-Black On Both Sides

Amen to the Fugees!

I'd also add

BDP - Criminal Minded (yeah I'm a little partial since I'm from the Boogie Down)

and

Dr. Dre - The Chronic (and I'm a buddah head too)

Forgot to add to the list

Salt 'n Pepa "Hot, Cold & Vicious"