1. Laptop, power adapter, essential software (1 DVD).
2. Sony PSP (w/2-3 games & movies), power adapter, .mp3s on MemoryStick
3. Any paperwork necessary for the trip.
4. Treo 650 and charger, bluetooth headset.
This all goes into an Osprey Torque, along with 2-3 days of clothes, a couple of sets of workout gear (shorts/t-shirts), assorted PowerBars/Zone Perfect bars, a book, my shaving kit and a pair of running shoes clipped to the bag with a carabiner. The best thing? The Torque fits into the overhead bin on RJs loaded this way.

I'm lucky in that my gig doesn't require suits, etc. I can get everything I need for a 4 day trip into 1 small bag.