This site lists "the overall rankings for the best albums in history as determined by their aggregate positions in over 1,800 different greatest album charts":
http://www.besteveralbums.com/overall.php
Here's their top 20 all-time (they also break it down by decade, which has some fascinating results IMO):
1. Radiohead OK Computer (1997)
2. The Beatles Revolver (1966)
3. Pink Floyd The Dark Side of the Moon (1973)
4. The Beatles Sgt Pepper's Lonely Hearts... (1967)
5. The Beatles Abbey Road (1969)
6. The Beatles White Album (1968)
7. Led Zeppelin Led Zeppelin IV (1971)
8. The Clash London Calling (1979)
9. Nirvana Nevermind (1991)
10. The Velvet Underground The Velvet Underground And Nico (1967)
11. The Beach Boys Pet Sounds (1966)
12. Radiohead The Bends (1995)
13. Radiohead Kid A (2000)
14. Bob Dylan Highway 61 Revisited (1965)
15. Arcade Fire Funeral (2004)
16. Pink Floyd Wish You Were Here (1975)
17. Radiohead In Rainbows (2007)
18. U2 The Joshua Tree (1987)
19. The Beatles Rubber Soul (1965)
20. The Who Who's Next (1971)
Of special note to me: my beloved Radiohead have finally dethroned The Beatles perenial #1 spot on these lists.