Other
Winona State University: Confessional Poetry
An explanation confessional poetry and examples of the writings of the confessional poets; Sylvia Plath, Anne Sexton, Sharon Olds, and Robert Lowell.
Academy of American Poets
Poets.org: A Brief Guide to Confessional Poetry
Concise explanation of the term "confessional poetry." It's mainly a discussion of the poetic movement of the 1950s and 60s, and it also includes example passages by Sylvia Plath and John Berryman.