Keeping track of what is going on is difficult enough, but spelling seems to be a regional decision as well. The New York Times uses Mujahadeen and Taliban, the Times of London and the BBC use Taleban and Mujahedin. The AP combined those into Mujahedeen while Reuters came up with Mujahadin, both use the spelling Taliban. I’m not sure what I’ve been using, but I’ll try to follow the NY Times spellings from now on.