It sounded like fun, so I decided to try it out. Since it's hard to sound like yourself when you're self-consciously trying to, Janice suggested I paste in something from one of my blog posts. I chose the one about our three cats having an unexpected and unwelcome visitor in the home a few weeks back (http://sacnoths.blogspot.com/2010/06/rigby-hastur-feanor-and.html), plugged it in, and hit the 'analyze' button. The result? It says I write like . . . Cory Doctorow. Eww. Another piece from another post gave the result H. P. Lovecraft. And a third, from yet another post, said James Joyce. So apparently I either 'do the police in different voices', so to speak or the program shows its limitations pretty early on.
Then, thinking about all the faith the anti-Hooper school put into computer word analysis programs no more reliable than this one back in the day, I thought it'd be fun to plug in a passage from Lewis's THE DARK TOWER and see what it made of it. The results: P. G. Wodehouse, of all people. A passage from THAT HIDEOUS STRENGTH it indeed identified as having a different style, suggesting that it might have been written by Margaret Mitchell, while OUT OF THE SILENT PLANET registered as Shakespeare and PERELANDRA as having been written by H. G. Wells.
I have to give it credit for one thing, though: when I typed in the opening sentences from THE LORD OF THE RINGS, it said that author wrote like . . . J. R. R. Tolkien. So, score one out of eight for the system. I'm envious of THE DARK TOWER for having gotten the Wodehouse result, though.
current reading: THE QUEST FOR SIR ARTHUR CONAN DOYLE (ed. Lellenberg) & THE LOST EXPLORERS  by Alexander MacDonald
current audiobook: THE FATHER XMAS LETTERS, read by Derek Jacobi
*apparently the site's inventer scanned in three books each by fifty different authors, so its sample size for comparison is relatively limited.