There's a fun little time-waster out there on the Internets called I Write Like. All you do is paste some of your writing (novel, blog, comment, etc.) and it analyzes your word choice and overall style, then compares it to the people you pay to read.
Of course, a lot will depend on what you choose to analyze. For my more descriptive or passive selections, I got writers like Cory Doctorow and Ian Fleming.* However, my writing is action- and dialogue-heavy, so the guy I get the most is:
Damn right. :-)
*I got "I write like Dan Brown" once, and I immediately rewrote that short story. Not kidding.