BrainTripping, which Matthew Huebert launched in 2012, is a beautifully executed web app that allows you to "trip" on the brain of a famous person: Jesus, Kurt Cobain, Steve Jobs...
In this case "tripping" means generating stories/conversations/poems in the style of a particular person. You can use shortcut numbers 1-9 to grab suggested phrases, making the writing experience fluid, almost automatic. Alternately you can type in your own text, so long as it's contained in the vocabulary of the person you are tripping on.
BrainTripping shares some qualities with Today. Both apps model language based on a corpus, and provide an interface for the user to guide that model to his tastes.
Personally, I'll always find this interaction between human and computer preferable to "bots," which automate the output entirely. It's surprising and kind of a shame there aren't more apps like BrainTripping, considering the growing interest in bots and language modeling.