I understand what your saying as far as tracking. I actually have a spread sheet that tracks inventory as well as numerous other things. I currently have it on excel but will probably put it on google docs soon so I can adjust things on the go. Google docs is stored "in the cloud" so no matter were you last adjusted it from or opened it it will be the same on all devices. If you haven't given google docs a try you might want to look into it as this may fill your need.
That being said the dossier/journal idea has always been something I've enjoyed doing. I have a small leather book and a nice pen that I enjoy jotting down my initial limited thoughts. It's just a small part of this hobby I enjoy
