Guides

• Travel Wiki - good for overall basic info
• iGuide - cool use of Google Earth
• Travelfish.org - South East Asia

Fun/Interesting

• Atlas Obscura
• Geocaching - fun!

Accomodation/Flights

• AirBnB
• Couch Surfing
• Lastminute.com
• House Sitters America
• Sky Scanner

US Government

• Travel State.Gov - passports, visas, medical, travel alerts and warnings
• Government Executive - compiles gov websites on travel
• Register Trip

Travel Insurance

• World Nomads