Wow, I love the capabilities Photoshelter has. Photoshelter is what I am using for my photography website, which is scheduled to launch at the end of July.
Last month I did a photo-shoot in Orlando, Florida with a friend. While back in New York, I was able to post her portraits in a private gallery on my Photoshelter site where only she can view them.
The best part is she can rate each portrait using a 5 star system, as well as post comments on individual portraits. I can post my star ratings independent of hers. The Matrix Rating button allows us to compare both of our ratings for each portrait side by side.
This feature, along with many others, makes Photoshelter a great site for photographers.