I have read all of his books except the newest one (which is sitting in the 'to be read' pile) and I still howl with laughter through Notes from a Small Island and Walk in the Woods.
I think Bill Bryson is pretty much the best non-fiction author out there right now.
One of my favourite moments is when he's in the B&B wondering what the fuck a counterpain is. Fabulous. Utter genius.