Around the same time I started using Ubuntu I found Tomboy and it was a note-taking system unlike anything else I’d ever used. To me it was the great differentiator for the Linux desktop for a bit. It is a desktop-wiki that provides some incredibly interesting concept. I thought it had quietly passed away but it turns out it has been ported to a new stack and lives a good life with support for Mac and Windows under the Tomboy NG name.