Yahoo! just released a report on this decades biggest selling artists. Eminem easily tops the list with sales of 31 million, with his biggest seller being 2000s, The Marshal Mathers LP which saw sales of 10 million. The rapper just beats The Beatles, who comes in at #2 with sales of 27.5 million, with their greatest hits compilation, 1, being their biggest seller --moving 11.4 million.
The biggest highlight on the list (for me) is Britney Spears, who comes in at #5 with combined sales of 22.9 million, making Spears the biggest selling female artist of the decade (she's also the only female in the top 10). Her biggest seller is 2000s, Oops!...I Did It Again which moved a little over 9 million units. Check out the whole list, here.