Just thought that since the D90 has been out for about 3 years, it was likely there had been at least 1 firmware update from v. 1.00 (which I assume was the original version from when it was first introduced?). Maybe not.
Yes, I did update the distortion control data to v. 1.002.
When Nikon updates the firmware, All previous updates are included in the latest version of the firmware. Keep in mind that the D50, D60, D70S, D1, and D2XS which are all significantly older than the D90 have never had their firmware updated. Good Luck and Enjoy your Nikons!