Member Rara Avis
It's a large, long list, with names like Robert Frost, Billy Collins, James Merrill, Alfred Lord Tennyson, Emily Dickinson, E.E. Cummings, T.S. Eliot, Mark Strand, Walt Whitman, plus lots of collections, anthologies and literary supplements.
To answer your second question, I was reading Billy Collins on the plane ride home from Las Vegas back in January, and immediately wrote "The Worst Cup of Coffee."
You can't help but be influenced by the voices you read. They sorta just get absorbed into you, until you don't realize the separate strains and inspirations anymore, and they all work to form one, unique voice -- yours.