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Bailey's signature:
"Kimberly, Durham in the house.  Go Devils!  Sorry to hear about your choice of 'Academic' (I use the term loosely) institutions, but all the best anyway.  Bailey Chase"

Explanation:

Bailey's Alma Mater, Duke University, is in my hometown, Durham.  (Their mascot is the Blue Devils.)  My university is Duke's rival - hence the taking pot shots at my choice of schools.
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Greenwalt's signature:

"Kimberly - Thanks for watching - Best to You, David Greenwalt"

 
 
Joss' first signature:

"Kiba!  Joss Whedon"

 
 

Joss' second signature:

"Lub to the wibe!  Keebs!"  © Joss Whedon

Explanation:

Visit  jossisahottie.com 

 
 
Joss' signature inside my hat:

"I'm in your head Joss"

 
 

Little Willow's signature:

"Hey Kiba!  Enjoy the Evil Chronicles & be well.  Have a safe trip home.  :-) Little Willow"

Explanation:

Little Willow dubbed my PBP journal "the Evil Chronicles," presumably because Joss is evil.

 
 
Marc's signature:

"Those Damn durham (<- note the lower case) people!  Thanks for being here!  Have fun - © Marc Blucas"

Explanation:

Marc attended Wake Forest University, which opposed Duke.  Since Bailey was a "Durham person" and I told him I was from Durham, Marc teased about it.  A lot.