Halo and Sprocket is a comedic series with a lot of philosophical and intellectual ramblings, not unlike Calvin and Hobbes. Click on the link; it goes to the first (and in my opinion, the seminal) story. Even if you never pick up the trade, be sure to read this story.
In a nutshell, it's the story of a robot discovering humanity with the help of a woman and an angel. Or it's the story of how a woman teaches a robot about humanity with the help of an angel. Or any of a number permutations thereof.
Although the art isn't quite up to a lot of mainstream standards (lacking in detail, cartoony, black and white), it's still quite good, and very excellently matched with the subject matter.