I can use Canon EOS Utility to shoot tethered so that the live-view preview is displayed on the computer screen.
However, I would like to know if there is any third-party software (non-Canon) that supports Canon DSLRs and live-view shooting. I am using Mac, but feel free to suggest software for any platform.
(For example, Apple Aperture supports tethered shooting; however, it does not display the live-view preview.)
PS. Tip of the week: If you are using Mac OS X Lion + EOS Utility, do not upgrade it to the latest version. Older versions (2.8.1) seem to work somewhat ok on Lion; the latest version (2.10.2) simply refuses to start and displays the message "Cannot be used with this version of the operating system".