Zettelkasten
An interesting approach to note taking that has similarities to a wiki. Originally implemented using numbered index cards. Cards can be cross referenced and can link to one another by id. Each card covers one topic in a manner such that the card can be read and is useful standalone (The cards are atomic). Each card has a defined home in the catalog (determined by ID) thus making it easy to perform cross referencing and find cards later.
In digital form, each note is typically given a unique ID based on the date and time it was created. This ID is then used to link notes together and build topical trees. In addition, notes can be "tagged" to indicate related topics or otherwise categorize the note. These tags can then be used to find the notes later.
Should investigate making awiki support some of the ideas here: