I like the fact that the D90 still gets love from Nikon. Here's a new firmware update you can download if you choose to.
Nikon Published 02/17/2011 - Updated 03/26/2013
The Distortion Control Data firmware upgrade is available for Nikon D4, D800(E), D90, D7000, D5100, D5000, D3200, and D3100 cameras.
Distortion control data are used to correct barrel and pincushion distortion during shooting and editing. They can be loaded into cameras that support distortion control.