Here's a link to a good article: The 10 Habits of Highly Organized People.

And here are the highlights:

1. Walk away from bargains
2. Never label anything "miscellaneous"
3. Stick with what works
4. Make peace with imperfection
5. Schedule regular decluttering sessions
6. Create a dump zone
7. Ask for help (that's me, and my number is listed right here!)
8. Separate emotions from possessions
9. Foresee (and avoid) problems
10. Know where to donate