I'm a big fan of the CONECA site. I've used it a number of times to find out how common all my doubled dies I found in circulation were. :) The only thing about the site that drives me absolutely insane is that the Titles of the *.html documents are all off base. Nearly all of them say "Roosevelt Dimes RPMs" even if they are for Eisenhower dollars. Pretty small complaint though considering the wealth of information offered