I have been using ACDSee Photo Manager for several years now. I joke that I cannot scrap without it- and it is true! :lol:
I use it to keep my scrap supplies organized as well as my photos. Some of my favorite features are being able to import my photos and "tag" them as they are downloading.
I love being able to find the paper/element I need with just a few clicks or a Quick Search.
I use the Caption and Author Fields to add my Kit name and Designer name so it is easy to credit what I am using.
And last- I am a Brush and Font collector and I am thrilled that I can use PM to view and load brushes and fonts.
You can get a free trial at acdsee.com
If you go to digiscrapinfo.com, you can also get some good tutorials to get you started. There are also a lot of good threads on it right here.