A590is
What is the best A590IS Canon / Canon A720IS. Please indicate the reasons.?

A590: Optical zoom dark gray, more cheap 4x (35-140 -135 mm equiv.) focus range of 5 cm, is only 20fps VGA video, you can take SDHC cards. A720: silver, more expensive, 6x optical zoom (35-210 mm) focuses from 1 cm, can take VGA video at 30 fps, you can not use SDHC. Other differences are fairly minor. I stick with the A720.