my imac came with tiger preinstalled, i directly, without doing anything else, used the leopard drop in disc. i installed leopard, fine, and everything, but those tiger install discs, to i need them? do they have something my leopard drop in doesnt have? can i just toss out those 2 grey cds? they have this package that installs bundled software that came with the imac, but doesnt that like install the tiger stuff? my leopard drop in doesnt have this bundled software thing. i also bought leopard for my mbp, neither does that one, its like my drop in for my imac.