The A720IS firmware is still under development, it is one of the cameras which uses the new operating system so it will take some time before releases are available.
You might like to keep an eye on this thread;
http://chdk.setepontos.com/index.php/topic,234.0.htmlJeff666 and ewavr are the primary people working on the A720 at the moment
CHDK is basically a firmware patch/extension for Canon PowerShot cameras which adds extra features and allows bypassing of some of the camera's limitations;
Primary additions are:
* RAW Shooting (a feature normally limited to DSLR's)
* Scripting support
* Battery meters (in my opinion a glaring omission on Canon's part)
* Timelapse Photography
* Live 4 channel histogram
* Zebra mode (blinking highlights and shadows)
* Motion Detection (some builds)
* Remote Shutter Release via USB port (some builds)
* High speed shutter (up to 1/64,000; some builds)
* Long Exposure (up to 65 seconds; some builds)
* F-Stop override (smaller apertures; some builds)
What you need to know about CHDK as a user;
You will need to find your camera's firmware version (1.00c is the only version which has been dumped so far), you can find this by following the steps here;
http://chdk.wikia.com/wiki/FAQ#Q._How_can_I_get_the_original_firmware_version_number_of_my_camera.3FOnce CHDK is released for the firmware version of your camera you will be able to download a file DISKBOOT.BIN, all you need to do then is copy it to the root of your camera's SD card and lock the card (the card lock is bypassed by the firmware so you can still shoot photos)
