Bartleby Verse
http://www.bartleby.com/verse/
Search poetry anthologies from the late 1800s to the early 1900s.

Poetry Foundation
http://www.poetryfoundation.org/
Extensive site includes issues of Poetry magazine.  Click on “Poetry Tool” to search for poems by category, occasion, title, first and last line, glossary term, author, and school or period.  Also contains good biographical sketches about many poets.

Poets’ Corner
http://www.theotherpages.org/poems/
Search for poems by title, author, subject.

The Poetry Archive
http://www.poetryarchive.org/poetryarchive/home.do
Search for poems by theme.  Listen to well-known poets read their works.

University of Michigan Humanities Text Initiative American Verse Project
http://quod.lib.umich.edu/a/amverse/
American poetry before 1920.

poets.org from The Academy of American Poets
http://www.poets.org/index.cfm

Representative Poetry On-line - from the University of Toronto Libraries
http://rpo.library.utoronto.ca/display/index.cfm

Poetry 180 - from the Library of Congress
http://www.loc.gov/poetry/180

Modern American Poetry
http://www.english.uiuc.edu/maps/
Includes biographical information and criticism.

The Writer’s Almanac – Garrison Keillor
http://writersalmanac.publicradio.org/index.php
Poems selected by Keillor for his radio show.  Search his selections by author or title.

Favorite Poem Project - Boston University, the Poetry Society of America and the Library of Congress
http://www.favoritepoem.org

The New Yorker Fiction and Poetry Search – The New Yorker
http://www.newyorker.com/fiction/poetry/search
Contemporary poetry as published in The New Yorker.

Poetry Daily – The Daily Poetry Association
http://poems.com/
Contemporary poetry from books, magazines or journals currently in print.

Fooling with Words with Bill Moyers - PBS
http://wnet.org/foolingwithwords/

PicLits.com
http://www.piclits.com
Create your own poetry by using provided photos and words as inspiration.

RhymeBrain
http://www.rhymebrain.com
Rhyming dictionary.