I did start to have a separate folder for CU items, brushes, actions, styles.
I started to tag my supplies, but got to be to much for
With the exception of challenges, I usually scrap a page with mainly 1 kit
that has saved me tons of time in listing credits
I am not sure about keeping the zip and double clicking it -- I know you can view items in the zip, but I have had zip files get corrupt after a while. I will unzip a file, rename things if I have to, delete extra stuff like blinkies or multiple folder/preview files, things I know I will not use ( this is tough for me, but sometimes I know i will not be using a bright orange argyle paper :)