AWhat's the 1 (or even 3) item that you absolutely can't travel without?
My Nexus 7 tablet. Small, easy to carry and great for internet access, movies, music, reading, games, etc. Great battery life and app selection too.
AEurope: Next flight in...8 hours! What to do during a long layover?
If I know ahead of time I will have a long layover, I will research the local area to find out if there is an interesting place to eat. With a bit of planning you can usually get into the center of town, eat a good meal, walk a bit, and be back at the airport in no time....