Forum Moderators: open
The bot visited me today as well. Fortunately it obeys the robots protocol and didn't take any images.
User-agent: *
Disallow: /images/
This will tell all image bots not to go in your images folder. If you have many images folders repeat with full path to all images folders.
User-agent: *
Disallow: /gizmo_folder/images/
User-agent: *
Disallow: /widget_folder/images/
If you want to disallow only Google, go for :
User-agent: Googlebot-Image
Disallow: /images/
As examples: I have a number of slide-show sites. Two of them are travel photo sites and have quite respectable PR, and the whole reason for their existence is to showcase those photos. I'm not about to block a search engine that's interested in those site's graphics. On the other hand, some of them are sub-sections of my family domain with stuff like my aunt's wedding photos. The family site, while publicly accessible, isn't ever going to be of much interest to people outside my extended family. No real benefit to be had from serving those image files to spiders, just bandwidth use.