I usually use 5 windows with notepad and 2 windows with Nescape while editing. This allows me to cut and paste between web pages. This has the consequence of classifying the pages into general classes. These classes are not limited by directory structure. A page can be the member of more than one class.
Classifications can refer to each other.
This class developed because I had problems making a bibliography database. Notes for PhD proposals , similar stuff to class b, but more conjectures. A classification of the processes involved in gas nets Classification by gene function . The librarian's problem and gene databases in the Human Genome Project.