It won't be cheap to load up a 24 GB machine -- $2,000 at today's prices -- but DDR3 prices are down 35% in the last three months and will continue falling.
The masses like us can expect virtualization to become a lot more common as memory -- the key ingredient in virtual machine performance -- becomes cheaper. Business users of workstations, Rejoice!
I can also tip my own hat, recalling that four years ago I predicted the crossover to 64-bit operating systems would occur in 2010. With cheaper, denser memory such as the Kingston Value RAM 4 GB parts, that prediction looks like it's in the bag for mainstream machines next year (performance machines are already running 64-bit OS versions at 6 GB memory and up).