I think your answer is a card reader. You stick your card in it, go to whatever the mac equivalent of Windows Explorer is, sort the files by date, select the new ones and copy them to your hard drive.
Personally, I use Breeze Browser Pro made by Breeze systems. Check it out, download the trial version, get a card reader and get after it. That is exactly how I just finished going through 5000 pics from a lacrosse tournament last weekend. I had several games on each memory card, each in a folder. If you don't know how to make a folder in your camera, read through the manual. It is the menu where you format the card, or make changes to the file naming. I always reset my image counter to zero before each event.
Good luck. My Canon software never gets used.
Mike