Wow. This is a wide open question. I have way too many favorites to think of, even harder to list. These are all part of a regular rotation and have to be up there in my top 100 "rock" albums:

-Led Zeppelin: III and Houses of the Holy
-Quakes: Last of the Human Beings
-Beatles: White Album, Let it Be – and of course that beauty of many songs in one (Side 2 of Abbey Road)
-Fireball Ministry: The Second Great Awakening, FBMEP
-Pink Floyd: Meddle, Obscurred by Clouds, The Final Cut
-Drive-by-Truckers: Southern Rock Opera, The Dirty South
-Ween: White Pepper
-Tiger Army: Ghost Tigers Rise, Power of Moonlight
-Steely Dan: Aja
-Jane’s Addiction: Nothing’s Shocking
-Neil Young: Decade, Silver and Gold
-Guns N’ Roses: Appetite for Destruction
-Elvis: too many to mention…
-H.I.M.: Love Metal
-Grant Lee Buffalo: Fuzzy, Mighty Joe Moon
-Misfits: Legacy of Brutality
-Faith No More: Album of the Year
-Cult: Love, Electric, Sonic Temple
-David Bowie: Ziggy Stardust, Heathen
-Black Sabbath: Self Titled, Technical Ectasy
-The Clash: On Broadway, London Calling
-Rush: 2112, Moving Pictures, A Farewell to Kings
-Jethro Tull: Aqualung
-Buddy Holly: anything he put out in his short career is amazing...