Carolyn Crowe created the most amazing list of stamp sets and shared it with everyone. I have added a few missing stamps, reorganized them to make my organizing easier, and added a Category column which also heled me with my organizing (there are a LOT of blank spaces so if you have any of the stamps that don't have a category, please add it!). My version is now located in Google docs for all and sundry to use.
Carolyn has a version too and hers might make more sense to you than mine. Please use whichever works best for you! And a HUGE thanks to Carolyn for her hard work in creating the original list!! You rock!