Study what to do if your U.S Passport is Lost or Stolen.
Skype, Viber, and WeChat are all apps for your mobile phone to help you keep in touch by talk and text at very low rates (and for free while on WiFi). EasyClock helps you calculate what time it is back home.
On a long-term journey and looking for something to do? WWOOF is a great opportunity to find volunteer work with hosts that provide accommodation and food in exchange for your efforts.
For more destination advice from other bloggers, photographers and designers, check out my Reading List.