Fetchnotes - Fetchnotes helps you capture and organize short notes like books to read, ideas and shopping lists...
TiddlyWiki - a non-linear personal web notebook
Zim Wiki - Zim is a graphical text editor used to maintain a collection of wiki pages. Each page can contain links to other pages, simple formatting and images.
Scribbleton - The little personal wiki.
ZuluPad - ZuluPad is a notepad on crack.
MyInfo - MyInfo is the most versatile organizer for Windows