I have the same issue with '06 Eddie Bauer Explorer. Took it to the dealer and they initially said it was a hose clamp. They tightened it up and said I was good to go. It continued to leak however, so I returned it and now they are telling me it is a cracked radiator. I have contacted Ford, but they were no help. Looks like a little over $600 bucks for the dealership to replace it. The problem was first noticed with 37,800 miles on the vehicle ... 1,800 miles out of warranty.
I have filed a complaint with
Office of Defects Investigation at the NHTSA (link) ... there were several complaints about this on there already. It would really be nice if ford would just admit they have a problem with these radiators and cover them outside of the warranty. A radiator shouldn't go out at 37,800 miles.
-Brandon