Thanks for the list everyone. I'm a guy, so can skip the scrunchie/perfume. I've started to group some of these together below. I also noticed that I have two 2.5hr layovers (in SFO and IAD) so I plan to bring the laptop and an AC adapter.

Essentials
Cash/ATM Card
Tickets (duh)
Cell phone
ID/Passport (I am all domestic)
Listing of alternate flights/routing in case of IrrOps

Toiletries & Personal Care
Toothpaste & Toothbrush
Deodorant
Valerian (natural sleep aid)
Change of undies
Change of socks
Change of t-shirt/top

Entertainment
Book(s)
Camera
Laptop with AC Adapter & movie(s)
Headphones
Notebook to take notes, pen

Other Notes
Skip the snacks & high fat foods to lose some weight (dang, beer too?!)
Bring fruit (apples & oranges?)
Dress comfortably with loose-fitting dark garments (no leather chaps )