Samsung made this nice little video (Viral even) which shows how much of a bottleneck a traditional harddrive can be. Thou they do stripe the disks for even more super fast access. (Hardrive performance isn’t my strongest point, but I’m guessing you could achieve similar throughput speeds by striping regular disks as well (but with longer seek times)). 2GB/sec is either way pretty insane.
And the result: you can open all apps in the office suite in .5 second.
Via Cat, who sent me the link for the video.