Not strictly Western Canon, but I have thoroughly enjoyed the following recently:
- 'The Selfish Gene' by Richard Dawkins
- 'God is Not Great' - Christopher Hitchens
- 'Einstein's Cosmos' - Michio Kaku
- 'Long Way Round' - Ewan MacGregor and Charlie Boorman
- God's Debris - Scott Adams
That last one is a free download, just search anywhere for the title.