I love Shelf! I've been using it for a while now and it really helps me find and organize my cloud content. As storage of information and ideas gets messier and messier, Shelf helps me feel organized, knowing I can get to anything I need with ease. I can't wait for the future integrations that will make accessing my information in the cloud even easier.
It's been a great organizational tool for my own use, and it makes it easy to distribute specific items to different groups of other folks. Very effective and flexible overall.