What tagging system do you use for your photo collection?
I ask because tagging is the only way I can make sense of my large photo collection and I am trying to improve the effectiveness of my photo tagging.
For example, do you simply tag on the fly, creating tags to fit the photo? Do you have a well defined set of tags? Do you have a hierarchical tagging system? Do you have rules for the way you create or assign tags? Is there a better way of organising my photos than using tags?