It came with Snow Leopard, but I already upgraded to Lion.
Is Rosetta an emulation software? I've seen it referenced, but I always thought it was the foreign language software.
It is a simple 'translator' that enables Intel machines to read PowerPC code but with Lion that has been done away with. Maybe an approach to the software developer will see an Intel version released. With my favorite game, "Solitaire to Dawn', the writers are currently working on an Intel version.
http://en.wikipedia.org/wiki/Rosetta_(software)