"Nikon has today announced a firmware update for the D300, taking it to v1.10. The update improves focus performance in dynamic-area AF mode contrast-detect mode in live view but also looks at a whole range of other issues."
"Canon has released new firmware for the EOS 50D, taking it to version 1.0.3. The latest version corrects three issues, two of which the company describes as 'rare.' One of the problems addressed is the much-discussed Err99 error message that can prevent the camera taking photos."