I've been using a SSD in a 2nd gen macbook pro for a couple weeks now. Huge improvement in system responsiveness. Basically: it makes beach-balls go away. If

I've been using a SSD in a 2nd gen macbook pro for a couple weeks now. Huge improvement in system responsiveness. Basically: it makes beach-balls go away. If you look at the projections you'll see disk maintains a slight edge in capacity cost. Spinning disks will still be around for very cold data, much like how magnetic tape still finds a home in large data centers. (see the FAWN paper, Memory Cloud paper or the 2 sequels to Gray's 5 minute rule).