Poems and Poets

Tomorrow is National Poetry Day, which celebrates the talents and history of this slightly neglected and misunderstood genre.
Apparently sales of poetry books have remained rather good, despite the economic downturn and the fact that book sales have fallen. I'm surprised mostly because bookshops seem to think that poetry books need to be hidden in a remote corner of the shop, on maybe 2 shelves, slightly neglected.
I own a lot of poetry books, mostly by favourite poets like Wendy Cope and Carol Ann Duffy, but also classic works, The Waste Land by T.S Eliot being one of them. I like the power and humour poetry can convey, the way in a few words so much can be said.
Poetry is full of rules, and people breaking them, not all poems have to rhyme, they just need to have a rhythm all their own, and that elusive ability to say just what you were thinking.
What poems/poets do you like?