Before I left for South Africa I posted a few youtube videos from music I had referred to in my Society for Ethnomusicology world cup paper. Here are some additional related links.
The story of Waka Waka as told by Scribbles from the Den.
Zangalewa, the song Waka Waka is based on
WFMU Beware of the Blog has a great post about searching for the origins of this song, including numerous links to versions from all over the world.
I got all these links through the IASPM email list. Thanks to everyone who posted. I'm speaking on this topic at the IASPM conference in Grahamstown in June/July.