Here's an amusing site which claims to analyze text you paste in and tell you who you write like. I'm not sure if it actually analyzes anything or just randomly picks an author, but I could do this all day. When I have time, I'll reenter some and see if I get the same results.
I stuck in a few old blog posts and have gotten 3 Dan Browns, 2 David Foster Wallaces, Kurt Vonnegut, Stephen King, P.G. Wodehouse, Jack London, and James Joyce. Some of those aren't bad company, and for the others, I can only ask, "So where's my royalty check?"