If you want to talk to people in Afghanistan, it's a good idea to know how to speak either Pashto or Eastern Farsi (Dari). Pashto is occasionally taught at one university in North America, but Eastern Farsi seems not to be taught at all, although you might be able to get by with standard Persian (Western Farsi). There are a number of Pashto pages on the web, and you can listen to some Pashto and Dari broadcasts in RealAudio.