I found this pretty awesome tool a couple days ago: I Write Like. Warning: it can be very addicting. Basically, you copy and paste a few paragraphs of your writing sample, and it will analyze your writing style and tell you which famous writer you are most like. I stopped myself after six samples, but supposedly I write like Cory Doctorow, Anne Rice, Kurt Vonnegut, J.D. Salinger, Rudyard Kipling, and Gertrude Stein. Not sure how accurate the tool is, but it is definitely a great way to boost your self-esteem as a writer–especially on those wretched writer’s block days.