Yeats Society of Sligo
A society based in Ireland which has information on the whole Yeats family.
The Academy of American Poets
http://www.poets.org/poet.php/prmPID/117
Biographical and bibliographical information on W.B. Yeats.
Nobel Prize
http://nobelprize.org/nobel_prizes/literature/laureates/1923/yeats-bio.html
Official information on W.B. Yeats as a Nobel Prize winner.
National Library exhibition on Yeats
The National Library of Ireland's exhibition on W.B. Yeats.
The Rose
http://www.bibliomania.com/0/2/332/2424/frameset.html
Bibliomania's free online edition of The Rose.