Having stash is great... until you don't know what you have and end up buying the same pattern twice. Or spend hours searching for something you don't have.
Creating some type of inventory is helpful.... I admit it I really just want to catalogue it all and would if I could!
I haven't found a commercial product that easily keeps track of it all: patterns, different threads, magazines, fabric, gadgets etc. in an easy to use manner. There might be, but for now I'm using the Awesome Note app of my iPad.
I took some screen caps, each section of the stash has a different folder: