Personally, I nominate “Happy” by Ashanti.

What Is The Song Of The Summer Of 2002?
Who will let the dogs out this year? In the race to steal the summer’s airwaves, there’s always one break-out single that finds its way into every nightclub, car, shop and ballpark in town.
So far this year, it’s shaping up to be a battle between Eminem’s “Without Me” and Nelly’s “Hot in Herre” off “Nellyville.”
Eminem seems to be king of the hill for the moment, though the overall race is too close to call.
Of course, there’s the chance that neither could win.
Elvis Presley’s “A Little Less Conversation,” the G-rated dance remix of a 1968 tune, grabbed the top of the charts in London and got big radio play in North America last week.
Watch out, Elvis is in the building.