There's a good video clip and explanation of the kata Annanko performed slow and fast and with its bunkai at: DownloadKarate.com

The Sensei who performs it learned under Sotokawa Sensei who learned it from Mabuni Kenwa in Japan and is a 5th Dan with lived with a master in Japan.

Unfortunatley you can view just on its own, but their are alot of other kata that are great to watch!

Yours in budo!