If you haven't checked out any of his books, do it. They're mostly illustration, but the few words there are really add to them.
So far I've read Memorial, The Arrival (my favorite!), Tales from Outer Suburbia, and The Lost Thing. My favorite part from the Arrival was the part on secret poems that people write, and what happens to them when you crumple them up and throw them out the window or into the waste basket. I tried to find a picture, but none of them did it justice.
'It floats gently above suburban rooftops... inspiring lonely dogs to bark in the middle of the night.'