Are you worried about the websites hosted on the server which hosts your website? Here are the services which help you to check all websites which are hosted on server machine which hosts your domain. Reverse Domain IP look up services to find all neighbors of your website.
If you use Picasa image management software and are annoyed with the feature it caches all images automatically. Here is how you can exclude it from scanning images from your hard disk folders. Remove certain folders from scanning / remove multiple or all folders from scanning by Picasa.