I actually keep a word document (organized by category and subcategories) which lists what and where I have everything installed. As soon as I've installed a new product, I open Poser, go to that products location, verify it successfully installed, then I write down a brief description of the product and where it's located within Poser. The initial documentation is a pain, but this way I have a direct road map to what I want and I save myself countless man-hours of blind searching. For the curious minds, my document's structure is as follows:

Name=Name of Item, Location=Item's location within Poser, Description=Brief descprtion of item, Intended Character=Character(s) Item was created to be used with

1. Hair 
   (Name, Location, Description, Intended Character)

2. Clothing 
   (Name, Location, Description, Intended Character)

3. Characters 
   (Name, Location, Description, Intended Character)

4. Sets & Environments 
   (Name, Location, Description, Intended Character)

5. Props 
   (Name, Location, Description, Intended Character)

6. Poses
   (Name, Location, Description, Inteded Character)

Stay Focused.