I've stumbled upon this community that produces great online quizzes: http://www.sporcle.com
There are are lots of great geography ones and some that are related to linguistics. I've found it highly addictive and great for enhancing some language-related knowledge when I don't feel like doing actual work.
Here are some examples:
Most popular writing systems
http://www.sporcle.com/games/millenthingy/most-popular-writing-systems
Classify these languages
http://www.sporcle.com/games/tamius/classify-these-languages
Name the writing system
http://www.sporcle.com/games/1447/writing_systems