The Pen refers to the pen that plays such a central role in the Bill Malloy's mysterious death storyline:
(http://www.dsboards.com/THEPEN2.jpg)
And I have to say that for me an appearance by THE Pen would be quite interesting. :D And I'm very glad to see that it's leading in the poll. [thumbleft] Though, sadly, more than likely the "special guest" is a person. And as far as DS actors go, the most exciting would be to see someone like Henesy, Isles, or Kate Jackson - someone who's never been to a Fest. Almost anyone else will be a big [b071] and a huge [sleep].