I just purchased a 320-series SSD. I installed it in a Thinkpad with Ubuntu Linux as the operating system. How do I discover what firmware version is installed?
Open a terminal window and issue:
hdparm -I /dev/x
where x is your drive. If you're not sure of your drive label, use something like GParted (included in most Ubuntu releases afaik) to determine it.
This will print out a substantial amount of information about the device and you should see a line detailing the firmware revision.