We have loved every book we've seen of his (two DS aged 3 and 5) and my OH and I.
We have 'Don't let the pigeon drive the bus' and 'Pigeon wants a puppy' which my boys laugh and laugh at. (Thought they were strange when we first read them but love them now.)
We also have a few of the Elephant and Piggie series which are excellent, especially for first readers.
We borrowed this one from the library and loved it too.
Whenever I mention him to family/friends noone has ever heard of him, although it seems he is very popular in the US.
Does anyone else share our obsession?