I have seen a number of people link to this in the past few days but I only just now got a chance to view it. I knew I wanted to, however, because I read Adichie's novel Half of a Yellow Sun in 2006 when it came out. It was one of the best books I've ever read.
This talk did not disappoint me. She is an excellent speaker and she has an important story to tell. Better yet, she has many. I encourage you to take the time to listen.