Dewey Browser from OCLC

This is probably as old as the hills but I just saw it and loved it. The Dewey Browser. It looks as if they are using NetLibrary (owned by OCLC)as a database of titles cataloged in Dewey. They use colors to indicate broadly how many items are in each of the top 10 Dewey classes (0-9). You can drill down 3 levels (to 999) and they don't show any decimals.