The official video of the " FIFA World Cup 2010" Anthem by Somalian artist K'naan
First impression is that it's so-so. Doesn't really catch World Cup fever yet.
Here's are some other from previous World Cups. My favorite is from 1998.
2006 - Toni Braxton & Il DIvo - The Time Of Our Lives
2002 - Voices of Japan/Korea - Let's Get Together Now
1998 - Youssou N'Dour & Axelle Red - La Cour des Grands
1994 - Sounds of Blackness - Gloryland
1990 - Gianna Nannini & Edoardo Bennato - Un Estate Italiana
1986 - Stephanie Lawrence - Hero