It seems like there's a 150GB and 74GB VelociRaptor in the works. See the VelociRaptor support page, which mentions the 74GB and 150GB flavors.

"Specifications for the 150 GB Serial ATA II VelociRaptor drive (model WD1500GLFS)."

"Specifications for the 74 GB Serial ATA II VelociRaptor drive (model WD740GLFS)"

Let's keep the discussion away from the usual "Raptors are overpriced because you pay more per GB than normal drives. I'd rather get a 640GB drive." Great, wonderful, we know. Raptors aren't for holding your music and :banana::banana::banana::banana:, they're for your operating system and programs.