So for those who would like to know a bit more about Mali (summarized mainly from Wikipedia and the Peace Corps welcome book):
Mali is a landlocked country in West Africa, bordered by Algeria, Mauritania, Cote d'Ivoire, Burkina Faso, Niger, Senegal and Guinea. It is about twice the size of Texas. Through it runs the Niger and Senegal rivers in the south, where most of the population lives. The ancient Ghana, Mande and Songhai empires controlled much of the trans-Saharan trade through the Niger river (many traded through the famous city of Timbuktu). The northern region is mainly comprised of the Sahara desert. Mali has a constitutional democracy which was established in 1992, and is considered one of the most politically and socially stable countries in Africa. The national language is French, but many of the population speaks Bambara. The population is mainly Muslim (90%), but there are small populations of Christians and traditional animist religions (and apparently a few Saharan Jews!). Mali is know for its music (check out Amadou and Mariam, they're good!). The Peace Corps have been in Mali since 1971.
If you want to know more, you could, well, look at Wikipedia yourself, or check out these other resources:
https://www.cia.gov/library/publications/the-world-factbook/geos/ML.html (CIA World Factbook)
http://geography.about.com/library/cia/blcmali.htm (a great map of Mali with facts)
http://news.bbc.co.uk/2/hi/africa/country_profiles/1021454.stm (BBC country profile)
http://mali.usembassy.gov/ (US embassy in Mali)