Mine shift and change over time, but currently I have:
$ Priorities - budgeting stuff
*Important - A list of passwords, pins, etc.
2003 Goals
Checklists
CopyWriting - This one I'm currently moving to Bonsai because it got really big, and I wanted to be able to organize it a bit better
Herbs, Remedies - A list of various herbs and their uses, plus remedy recipes
Home & Crafts - A list of various crafts (like crochet patterns in progress), room color schemes, and other decorating ideas
Inspiration
Might Want To... - buy for house/office, do in yard, create, etc.
Misc.
Proj Details
Quotes & Fee
(I'm thinking about removing the above 3 soon)
Reference - This one runs the gamut from business to fun. Includes things like GTD Book Notes, Google PPC CTR requirements, Snippets of useful articles, and even game notes (sim city/sims/1602)
Additional lists live in Bonsai. These include: Cust followup timeline; Copy Planning; Research steps, triggers, and resources; My Garden plant list and details of care/growth/charactoristics/planting location; Recipes; Restaurant lists; An index of my lists; Misc. Facts of Interest; Swipe Files; Gift Ideas; Key people and relations. There are several others but you get the idea
I'm a bit proud of my "Key People and Relations" list. It has each of my kids, plus my husband and dog listed. Under each are sub-sections for lists of friends, teachers, health & growth data (I track when they're sick, doctor visits, allergies, milestones, etc), hobbies, and clothing sizes. Having this and making sure I keep it updated makes me feel as if I've paid a lot more attention to the family in the past couple of years.
Anyway, a bit long but there it is

Kathy