One of the great things about doing comic books (and I really do think it makes for better comics) is that you often collaborate with friends. Almost all of my happy experiences in the field have been when the artist was someone I could go to lunch with and have a good time, talking about all sorts of stuff. A perfect example is my pal, Will Meugniot (pronounced "Mineo") with whom I did a lot of comics, most notably The DNAgents. Here's a link to a recent interview with the guy.