When poetry is what you want (or what you keep running into), start here.
A Little Book on Form
Robert Hass
The Waste Land and Other Poems
T.S. Eliot, Frank Kermode
Letters to a Young Poet
Rainer Maria Rilke, Stephen Mitchell
The Divine Comedy
Dante Alighieri, John Ciardi
Collected Epiphanies of James Joyce
James Joyce, Angus McFadzean
The Uncollected Louis Zukofsky
Jeffrey Twitchell-Waas, Mark Scroggins
The Transcendentalists and Their World
Robert A. Gross
the princess saves herself in this one
Amanda Lovelace, ladybookmad
On Frost and Eliot
William H. Pritchard
Odyssey
Stephen Fry