Only a fraction of the neutrinos that the sun must be producing, according to what is known about nuclear fusion, reaches Earth. Scientists would like to know why. These answers won't be forthcoming until the Sudbury Neutrino Observatory comes on line next year. With respect to atmospheric neutrinos, their announcement is exciting, but I'm still skeptical. There's an awful lot of theory that goes into the production of muons and ions when cosmic rays strike the atmosphere, which is hard to understand really well.
Any discussion involving the enigmatic neutrino seems bound to generate a difference of opinions.