I've recently started making extensive use of the wiki style Tomboy notes application now standard in the Fedora distro.
After building up a few notebooks for myself I decided to introduce Tomboy to my wife so she can use it too for joting down recipies, or remembering how to do tasks on the computer.
Then it soon became evident that I needed to sync our collections together so I could help her document some things for around the house, etc... There were some good tutorials...