On 4 hour layovers, I have:
a. taken a take a portable DVD player and put that NetFlix membership to use
b. slept on the airplane
c. read a book
d. reviewed FOM, SOP, ASM (lots of fun)
e. listen to iPod / watch Podcasts
f. walk around the terminal looking at women


On a side note, where are you going that there is NOT a crew room? Even the BFE Colgan outstation airports had some kind of makeshift crew room.