tedster - 5:25 am on Feb 22, 2010 (gmt 0)
Nope, you're not wrong, you're ahead of the game. Google just announced something about this change to the site: operator in Image Search on their blog: [googleblog.blogspot.com...]
Based on feedback from users and webmasters, we have improved the [site:] operator for Google Images. In the past, the [site:] operator filtered based on the image URL, not based on the URL of web pages linking to the images. Now, the operator will run your search over web sites that include images, no matter where the images themselves are hosted, which removes a lot of noise from your results and gives you more control over what you're searching for.