It's good to see Sigma addressing some of the feature requests from users through this update. The digtal zoom buttons can now be customized to control settings such as white balance and ISO.

From the Sigma DP1 Software Download Page:

Benefits of This Firmware Update:

[Ver. 1.04]
1. A customizing function has been added to the Digital Zoom button.
2. The ft (feet) indicator has been added to the scale bar in MF mode.

Previous Updates:

[Ver. 1.03]
1. ISO 50 has been added into the ISO setting.
2. Grid Display mode shows Display Icons.
3. Shorten the pre-flash time in the Red-eye reduction flash mode.

[Ver. 1.02]
1. Correct the phenomenon that the "currently selected file" will be deleted, if the camera is turned off when the camera display remained in Delete Menu.

[Ver. 1.01]
1. Corrects the phenomenon of intermittent camera freeze under certain conditions.
2. The accuracy of the indication of the number of images that can be recorded with RAW format has been improved.
3. The grid display mode for picture taking is added to the LCD monitor. (It cannot be used in MF mode and movie mode)