Do you like to bookmark websites using a bookmarking site like Delicious or Bloglines? You can also bookmark and share images on sites like www.imgspark.com or www.ffffound.com.
According the the AAEL VRC Blog there is a Firefox plug-in that allows you to add images to your own library by right-clicking images and choosing Upload to Image Spark. The plug-in adds the url of the image, and you can add tags and a description. You can group related images by using the mood board or browse other users' collections. FFFFOUND! is a web service that allows users to post and share their favorite images found on the web, and recommends other images based on previous likes.