I'll be rooting for:
The good ol' USA (I hope not in vain).
The African nations because they generally play a wide open brand of ball (like Argentina and Brazil), and are fun to watch as obvious underdogs given their lack of funding.
Sweden -- there's a story here. When the Cup was held in the United States in '94, Detroit was one of the early round sites and Sweden was assigned to its group. I happened to be at Tiger Stadium watching a baseball game from the bleachers on an off day, when a dozen or so Swedish soccer fans strolled into the stands. They were wearing jerseys, carrying flag, and some were painted blue and yellow from head to toe. Being a fellow who appreciates this type of loyalty and enthusiasm, I stood up and yelled, "Go Sweden!" To which one of the Swedish fans replied matter of factly, "Ya, we are going to win the Cup." My buddies and I who were at that game, have rooted for Sweden ever since.
As a side note, I will miss the orange Dutch squad this year.