I can't wait for the new X25-M. Recently threw a 160GB X25-M (first gen) in a datamining database server to replace a 6x15k SCSI RAID 10 array, and it was 2.5x faster. One disk faster than six.
It was a very simple, unscientific test: ran a MySQL query with the old drives, then ran it on the new drive. Old drives took 5 minutes, new drive took less than 2 minutes.