I have a soft spot in my heart for well done handouts in game. I think it's my time spent playing Call of Cthulhu, pouring over fake newspaper articles and diaries for clues. Because of this, one of my common stops in the blog verse is Propnomicon. this blog always has some good links to spooky props and add-ons for horror gaming.
A couple days ago it posted some links to some fan paperwork set in the 'Verse. These pieces would be excellent props to use in a session of the Firefly RPG.
Here's a link to the initial stuff and here's one to a later page from the comments.