Zadie Smith talks the essay and the novel at The Guardian. An excerpt:
Novels, by contrast, are idiosyncratic, uneven, embarrassing, and quite frequently nausea-inducing – especially if you happen to have written one yourself. Within the confines of an essay or – even better! – an aphorism, you can be the writer you dream of being. No word out of place, no tell-tale weak spots (dialogue, the convincing representation of other people, plot), no absences, no lack. I think it’s the limits of the essay, and of the real, that truly attract fiction writers. In the confined space of an essay you have the possibility of being wise, of making your case, of appearing to see deeply into things – although the thing you’re generally looking into is the self. “Other people”, that mainstay of what [David] Shields calls the “moribund conventional novel”, have a habit of receding to a point of non-existence in the “lyrical essay”.