Japan's New Supercomputing Toy
Protein folding, modeling cell machinery, and simulations of other biological systems at the molecular level. Think about the number of calculations involved in modeling the interactions between a few million atoms in something as simple as the ribosome. Now imagine adding the water and solute environment that surrounds these sorts of molecules. Oh, you could ignore the water and do the simulation in a vacuum, but let's remember that a driving force in protein conformation is hydrophobicity. And if you want to try this over time, say even a few nanoseconds, then start multiplying baby.
So yeah, there are some good uses.