A Lover of Unreason: Assia Wevill, Sylvia Plath's Rival and Ted Hughes' Doomed Love by Eilat Negev and Yehuda Koren is now available in paperback by Da Capo. Amazon and Barnes and Noble say that the book ships within 24 hours.
Sylvia Plath Info Blog by Peter K. Steinberg. The blog of A celebration, this is.