i've never seen the actual camera mount. if image capture can't see it, then it may not be accessible. (i do know that under XP, some cameras do mount...)
one thing you can try is use the Terminal and see if the camera is mounted as a hidden drive... open Terminal and type "ls -a /Volume"
otherwise, CF readers work well. i have one and since then, i haven't bothered using the USB cable to connect the camera at all...