Though if anyone has suggestions on other good sites...

http://www.iej.uem.br/rank.htm

http://www.docoja.com:8080/kanji/keykanj?dbname=kokug&keyword=sex&stype=-1&dbmess=10

http://www.britain-at-war.org.uk/WW2/Cpl_H.T.W_Ashington/html/japanese_words.htm