This is a project for sharing a collection of items all at once, the idea being that you could share a whole collection of images links at once and present them in a nice way.
Not much has happened with this project it's still running on the free version of google app engine, but it's not really being worked on.
There is some pretty interesting js code in the way the images are laid out and presented to the user. I wrote about some of the technical challenges over at scrwall.tumblr.com or check out the source code.
Perhaps someone will be able to use this in a project of their own.