Attached Link: http://nikkisprite.com

 I keep my content organized by main figure. So for instance, I have

libraries/character/v4/clothes
libraries/character/v4/hair
libraries/character/v4/figures
libraries/pose/v4/clothes matts
libraries/pose/v4/skins
libraries/pose/v4/poses
etc...
on so on for A3, V3, M3.

I use ThumbsPlus to make contact sheets of the libraries. Contact sheets are useful if you have a lot of content --much faster to flip through contact sheets of hair styles, background, cothing matts, etc, than to sift through the content via Poser's interface.