Rolling Stone Magazine published in 2004 their list of the 500 best albums and singles of all times. These lists are now available in streaming audio, thanks to a Romanian online radio :
The list is pretty eclectic and offers a great musical trip through styles from the fifties to nowadays. By the way, I'm not sure how legal this is, so just in case you better hurry on this :Þ
(Found the list via le Blog de François, which I found via Sites Near Me, a cool hack of Google Maps mixed with GeoURL)