Typing "poetry" into a search engine will get you nowhere; or rather, it will get you everywhere, which is no use at all. Every angsty teenager should write poetry, of course, but only in a vanishingly small number of cases should anyone else ever read it. Herewith a short list of readable poetry on the web.

Dead white men; or, "classical" poetry:

Steve Spanoudis' Poet's Corner offers 7600 poems by 780 poets indexed by author, title and subject. Biographies of about 30 and photographs of about 120 poets (many of them somewhat obscure) are also available. They accept submissions, if you have a favourite poet you'd like to see included (but beware copyright restrictions!). The daily poetry break features a poem a day from the Poet's Corner collection, with commentary by Bob Blair. I frequently disagree with Bob's opinions, but he's interesting.

Representative Poetry Online includes about 2,900 English poems by over 400 poets. It's based on a 1912 textbook but includes hundreds of additional poems and poets as well as biographical data, commentaries and other features.

The estimable Project Bartleby offers a wonderful selection of verse anthologies and volumes. Special mention here to the best anthology of English poetry ever made, the 1919 Oxford Book of English Verse. Quoth Q:

My wish is that the reader should in his own pleasure quite forget the editor’s labour, which too has been pleasant: that, standing aside, I may believe this book has made the Muses’ access easier when, in the right hour, they come to him to uplift or to console.

The venerable Project Gutenberg currently includes 209 volumes of poetry, from Aristotle's Poetics to the selected poems of Oscar Wilde.

The American Verse Project from the U of Michigan contains entire books of poems from about a hundred authors, mostly 19th century.

The Poetry Archive has about 5000 poems by about 150 poets. Lots of advertising though.

Contemporary:

Poetry Daily will email you a contemporary poem every day, or you can read it online. There's an archive but, sadly, poems are only retained for one year.

Web del Sol is "a collaboration on the part of scores of dedicated, volunteer editors, writers, poets, artists, and staff whose job it is to acquire and frame the finest contemporary literary art and culture available in America and abroad, and to array it in such a manner that it speaks for itself."

Various and Sundry:

Verse Libre offers more than 13000 poems by almost 500 authors, both classical and contemporary, searchable/browsable by author and title. The random poem feature is fun (aaaahhhh! I got one by the horrible McGonagall when I went to fetch that link!), and I was suprised by the top 20 list (I expected it to be pure schmaltz, if not worse; I'm a snob and an asshole). Like Poet's Corner, they accept submissions (but not from angsty teens; published work only).

The Atlantic magazine online has a poetry archive which includes numerous essays and, best of all, audio files of poets reading their own and others' work. Unfortunately, they use the malignant and execrable RealAudio format, but as the spousal unit recently noted, there is at least one alternative way to access those streams.

The Academy of American Poets has photographs, biographies and selected works from over 450 poets. Some are living, some not; not all of them are American. Their listening booth has a nice selection of audio (more RealAudio I'm afraid).

If you like poetry audio, Laurable has more than 2500 links to audio covering nearly 500 poets.