There is a Linux program, qtpfsgui, which allows to create high dynamic range (HDR)
image from a series of images with bracketed shutter speed. I'm using the CHDK firmware for my Canon IXUS 70.
Below is a series of shots of the Franziskanerkirche in Salzburg, in the middle is the tonemapped HDR image. Well, lacking a tripod, the result is poor.
A higher resolution image is here (1024x766, 78 KB).