Just another GR refugee. Other than that, I had a stroke in 2004, and read almost anything I can get my hands on, though I have a particular weakness for history, mystery, and historical fiction.
I have listed most stuff I've seen over there that I think I've read, including when I was 5, so that skews things a bit. Also, most-read does not always indicate "favorite"; some of my favorite authors didn't write that many books, so will never score high by that rubric, alas.
My top 16 (just below that there's a big logjam) most-read authors:
Agatha Christie, William Shakespeare, Robert A. Heinlein, Isaac Asimov, Dick Francis, L. Frank Baum, Georgette Heyer, Dorothy L. Sayers, Roger Zelazny, Ellis Peters, Steven Saylor, Elizabeth George, Charles Dickens, J.R.R. Tolkien, James Thurber, and Laurie R. King.