From: How to Plan your Wedding...without going insane
1. Sign up for WorkFlowy 2. Create a project list and 'zoom in.' 3. Create sections for the major components of your project 4. Fill out the details 5. Use #tags and @tags to filter your lists 6. Share your list with your collaborators 7. Mark things as complete as you finish them. 8. Complete your project
I signed up recently after seeing repeated recommendations on HN however and its actually very good and I've started using it quite a bit already. I'm not sure that I could explain it sufficiently here so I'll just say try signing up and give it a go (it didn't ask me to even confirm my email address so getting started was pretty quick).