tap return twice while iPhoto is launching to do the same thing. Though I use image capture.
Molly, you can down some pictures on a Mac -- just use the Image Capture app instead of iPhoto. Launch it from the Applications folder, then plug in your camera and it shoulde detect it automatically. You can click Download Some and select individual images to download or click on an image you don't want and choose Delete from the Edit menu.
Any other complaints that a Mac fanboy can help you with?