My younger daughter, Thing 2, just turned 5. She is in Pre-Kindergarten, and will be starting Kindergarten in August. She knows her alphabet and her numbers, and spends a lot of time practicing her letters. Mostly, it's random letters thrown together. The only word she knows how to write is her name.
She has a miniature white board that hangs on her bedroom door, with a marker, and will often use that to practice words. Yesterday, completely by accident, she wrote the word ELF. When my wife pointed this out to her, she was incredibly proud of herself and declared that she would never erase that whiteboard.
Now if we can just team her up with an infinite number of monkeys and an infinite number if typewriters, she'll be able to recreate all of Shakespeare's works, seeing as show she already has a good start on "A Midsummer Night's Dream."