Free Rice

A game that builds vocabulary while donating funds to the United Nations World Food Program.

http://www.freerice.com/

USASpending.gov

"Where Americans Can See Where Their Money Goes" -- who receives government grant, contracts, etc.

http://www.usaspending.gov

Trip Advisor

Actual travelers share their opinions about hotels, tourist sites, etc.

http://www.tripadvisor.com/

Learn English With Pictures (or Audio)

A site for those learning English.

http://www.my-english-dictionary.com/

Degree of Confluence Project

Now here's a novel way to pick a travel destination! A confluence is where latitude and longitude integer degrees intersect. There are 16 such locations in Iowa. This site is collecting photos from confluence points around the globe.

http://www.confluence.org/