One of the things I have found very handy is to move all content to a top level folder where I get images for everything in the main library pane. It's a simple matter of moving the content up out of the ego folders and deleting them. The only "gotcha" is, you have to do it in all of the areas (figure, pose, etc) so that they all match. 

I also have my stuff grouped under "Clothing", "Characters", "Jewelry", etc. It was a real job first setting it up, but it has helped my workflow immensely.