Canon has made available for download firmware version 1.2.3 for the Canon EOS-1D Mark III and firmware version 1.1.2 for the Canon EOS-1Ds Mark III. 
The Updates allow the user to select AF points directly with the Multi-controller instead of the Quick Control Dial or Main Dial and additional ways to apply exposure compensation. They also [...]

As promised, Nikon has released a revised version of its recently withdrawn firmware update. The company has updated the ‘B’ firmware to V1.11, and has reissued the previously withdrawn V1.10 ‘A’ firmware.
This new revision fixes a photo corruption problem in the firmware update earlier this month.

A couple of days ago Nikon announced the release of firmware update version 1.10 for the D3. However it has been confirmed that when certain settings are applied with the updated firmware, image data may, in some rare cases become corrupted. Therefore Nikon have terminated this firmware update download, and a new update is expected in late [...]

Nikon have released the first firmware update (version 1.10) for the flagship D3 DSLR.
The following changes have been made in version 1.10:

Nikon have released a firmware update for its D40 6.0 megapixel DSLR.
This firmware (Version 1.11) is a minor update that addresses the following issue: Shooting times were not always accurately recorded within the image data for images captured in bursts of continuous shooting.
You can download the update file here

Canon has released a new firmware update for the EOS 40D 10.1 megapixel DSLR. The firmware update (version 1.0.8) fixes the following issues:

Fixes a phenomenon in which Image Stabilization operation emits a sound when certain buttons are pressed, with the EF-S 55-250mm f/4-5.6 IS lens attached to the camera.
Fixes a phenomenon in which the [...]

Canon has release firmware updates for the EOS 5D and EOS 30D models.
EOS 5D Firmware Update Version 1.1.1
This firmware update (Version 1.1.1) incorporates the following fixes and improvements:

It now supports high-capacity CF cards.
It allows the latest lens names to be recorded in the Exif information of images taken.
It adds lenses that are compatible with the [...]