My predictions for the eight groups:
Group A
I think this is the most difficult one to predict. French is usually either very good or very dissapointing, it's always hard to tell what it's going to be. Mexico and Uruguay are pretty much equals I think. And South Africa certainly has one of the weakest teams in the tournament, but it's become a bit of a tradition that the hosts always do better than expected. I don't think they'll make it to the next round though.
Group B
Argentina has some great players but Maradona is a disaster, so they'll have to do well despite him. They'll probably progress a round or two, but I don't see them winning the tournament. Same thing goes for Nigeria. I don't expect much from Greece and South Korea.
Group C
Should be a fairly easy one for England. I think it'll be between the US and Slovenia to decide who'll come in second.
Group D
Also a difficult one to predict. I suppose everyone expects Germany to win this one, but even though they don't have as much quality, Australia and Serbia will be tough to beat.
Group E
You'd think this one shouldn't be too much trouble for The Netherlands, but you never know. I expect more from Denmark and Cameroun than from Japan.
Group F
Should be a walk-over for Italy. I'd be surprised if New Zealand would get a single point out of their three matches.
Group G
Any other outcome than Brazil and Portugal going to round 2 together would be a big surprise. Same thing for North Korea as for New Zealand.
Group H
Spain will win this one easily, I think they're the strongest team in the tournament. Second place will probably be between Chili and Switzerland.