Albums you can listen to over and over again.

[Dr.K]

Reel Big Fish - Cheer Up
Offspring - Ixnay on the Hombre
Jimi Hendrix - Are You Experienced
Eric Clapton - Chronicles

[White Raven]

The Beatles - Abbey Road
The Beatles - The White Album
The Beatles - SPLHCB
The Beatles - Revolver
Pink Floyd - The Wall
Pink Floyd - Dark Side of the Moon
Pink Floyd - Meddle
Pink Floyd - The Piper at the Gates of Dawn
Pink Floyd - Wish You Were Here
Led Zeppelin - EVERY ALBUM THEY'VE MADE
AC/DC - Back in Black
The Presidents of the United States of America - Their first album
Rush - 2112
The Who - Meaty, Beaty, Big and Bouncy
The Who - Tommy
The Who - Who's Next?
South Park - Chef Aid
The Rolling Stones - Sticky Fingers
The Rolling Stones - Let it Bleed
Gilbert and Sulliven - The HMS Pinnafore

[Mindflare]

Sister Hazel - Fortress
Moxy Früvous - 'c' Album
They Might Be Giants - Flood
The Greencards - Weather And Water

[Big D]

Bic Runga - Beautiful Collision

Risa Ohki - Pray

Vivaldi - The Four Seasons

A bit of variety there
Virtually every night, I go to bed with a CD on endless repeat. It's great, falling asleep to your favourite songs and waking up to those same songs.

[DarkLadyNyara]

Evanescence-Fallen (I'm listening to it right now).

[Zeldy]

[SeeDRankLou]

As far as entire albums go:

"Ray of Light" by Madonna
"Version 2.0" by Garbage
"Another World" by Paul Oakenfold
"Appetite for Destruction" by Guns 'n' Roses
"When the Pawn...." by Fiona Apple

[ZeZipster]

"Version 2.0" by Garbage

That I can agree with!

[Little Miss Awesome]

Aha Shake Heartbreak- Kings Of Leon
Twentysomething- Jamie Cullum
Exodus- Utada Hikaru
There will be more, but I can't think of them at the minute!