Taking a look at the various squads, it seems that Côte d'Ivoire have the strongest squad in the tournament. Their stars include:

Kolo Toure (Arsenal)
Emmanuel Eboue (Arsenal)
Didier Drogba (Chelsea)
Salomon Kalou (Chelsea)
Yaya Toure (Barcelona)
Didier Zokora (Tottenham)
Arouna Koné (Sevilla)

Those are some exceptionally talented players, from some exceptionally big teams, and the attacking talent in that group is world class, and the defenders pretty strong too.

There are a lot of other teams with a few good players, but not with that many big names in the same side.

Nigeria run a close second with Yakubu Aiyegbeni, Obafemi Martins, Stephen Makinwa, John Utaka, John Obi Mikel, and Taye Taiwo, but their defence is very suspect. 

Cameroon have a squad with great overall strength, although they lack players in midfield to pull the strings, and their talisman Samuel Eto'o is still not yet fit after his long layoff from injury.

Despite all of these comparisons though, the competition is still going to be fierce. African teams at the World Cup is one story, African teams playing other African teams is another. Upsets take place galore, and the style of football, while perhaps being tactically/defensively suspect, provides a whole-hearted commitment to attacking and flamboyance that shoud make for some fantastic viewing.