Critics' lists not among the 18 at Best Ever Albums:
British Broadcasting Corporation - Music of the Millennium
Guardian - The 50 Albums That Changed Music
Short List - The 50 Coolest Albums Ever
Time - All-Time 100 Albums.
Also, one can read transcriptions of many more lists at Rocklist (one would like to think that the name is a pun on the word, rockist, but don't count on it) and a transcription of Vibe's 100 Essential Albums of the 20th Century at Dave's Music Database. You'll have to find the most-bored person in the world to write the creators of Best Ever Albums and ask why they don't include more of these lists in their equations.