Robin Good's insight:
Feedbag.io is a free web app which allows you to upload any .png, .jpeg, .gif, .pdf, .psd, .eps or .ai set of image files and to share it with another party that wants to review it.
You simply upload one or more images and you are instantly provided with a unique page that shows your uploaded pics on a left column of thumbnails and in the center of the screen, whichever image you have selected.
The "bag" of images uploaded remains online for you and other to see.
Supereasy to use. Ideal for sharing and reviewing image sets with people that need maximum ease of use and simplicity.
P.S.: While not officially advertised for this use, Feedbag.io acts as fantastic and quite reliable file converter for any .AI or .EPS file that you cannot view if you don't have access to a copy of Illustrator or Photoshop. You simply upload the .eps or .ai and in a matter of seconds you can see it finely displayed on your screen. From there you can capture it again and save it in your preferred file format. Very handy.
Free to use.
Try it out now: http://feedbag.io/