Traveler's checklist

What should one not forget going when traveling the road less traveled?

Check

• identity documents (ID card; passport; student card?; driver's license)
• tickets
  • transport (printed? confirmation e-mail? only ID card necessary? regular hard paper?)
  • residence (ID? confirmation e-mail?)
• transport
  • time schedule of transport
  • how to get from arrival to location of residence (plan, detailed description, address, phone number)
  • how does bus/metro/train system work?
• power plug type compatibility
• batteries
  • mobile
  • music player
  • camera
  • e-book
• mobile carrier network coverage
• alarm at home is turned off :)
• weather forecasts

Bring

• money
• camera+charger+rechargeable batteries
• clothes
  • pants, t-shirts, sweater, socks, underwear
  • rain suit
  • bathing trunks
  • dirty laundry bag
• towel
• toothbrush, soap, razor, deodorant
• pen+paper
• reading
  • e-book
  • study material
  • dictionary?
  • touristic guide
• mobile+charger
• bottle of water
• case for glasses
• sun glasses
• pyjamas
• little wallet for coins etc
• music player
• USB cables
• flash light
• universal charger
• homebanking equipment

Feel free to suggest more in the comments :)