http://www.state.gov/r/pa/ei/bgn/6619.htm

Similar to the type of information in the CIA Factbook, but with a different slant. At the bottom of each page, there is a list of links to other government resources on that country.

http://chinaskinny.com/

More business than economics, but it is a good place to get a feel for the issues, opportunities, etc. people are seeing in the Chinese retail sector

Two articles from the Economist archives, one from near the start of the crisis and one more recently looking back and discussing "wither Greece?"

http://www.economist.com/node/21543536

http://www.economist.com/news/finance-and-economics/21577076-back-source-euro-zone-crisis-daring-hope-fearing-fail

I had a hard time finding revision guides that I liked, but here's one:

http://ib-economics.blogspot.com/

Historical IB exams and markschemes in all subjects, including economics