I don't think that I could pick an all-time favorite writer. There are so many writers that my household has every book that they've ever written.
Stephen King, James Patterson, Christine Feehan, Lynn Kurland, Matthew Reilly, Douglas Preston/Lincoln Child....etc.
Right now I'm leaning towards the paranormal (werewolves, vampires, witches, fairies) and lately people have been bugging me to read the Twilight series especially since I absolutely LOVED The Host. I think that's going to be close to the top of my list of things to read next.