emorris--go back to mac-mike.com's forums--I responded there..
Have you set the G2 to PTP mode (not sure if this is applicable to the G2)?
From here:
http://www.powershot.com/powershot2/...er/macosx.html
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Launch Applications>Image Capture and see if it recognizes the camera. If not, go to Image Capture's Preferences (under the Image Capture menu), and under "Camera Preferences" make sure that "Image Capture" or "iPhoto" is selected. If that doesn't work--does the camera mount in the Finder (click on the "Computer" icon, and it should appear as a white hard drive in the same column as your hard drive)?
Your G2 might have older OS 9 only apps. If you click to the link above, the page will show you where to download OS X updated versions and/or purchase a new CD for $19.95
I have a Canon S230, but I use a FireWire Compact Flash reader and have no experience with USB connectivity. Tell us how you fared.
Take it easy... .