Zim is incredibly useful notepad like desktop application that is inspired by the way people use wikis.
With Zim you'll be able to keep track of TODO lists or ideas, to take notes during a meeting or to draft any other kind of text (blog entries, important mails, etc).

The tree of documents is created on the fly as you type, new pages are created by just typing a link. Pages are hyperlinked each other, and the system keeps track of which pages link to a given one (backlinks).
Any kind of file or url hyperlink can be inserted just by typing. When clicking on a hyperlink, zim will open the file or url with the default application
Zim keeps of your way, you even don't have to worry about saving, it autosaves on the fly as you go editing your documents.

Some key features are provided with plugins, like the calendar plugin, which allows to create calendar pages to keep a log of what you have been doing, and the task list plugin, which keeps track of tasklists created with checkboxes.

Downloads:
It is in extras-devel repository, enable it and install zim with the Application Manager or apt-get.
You can download and install complementary packages and old releases from the garage homepage
http://zim.garage.maemo.org

This is a work in progress, so expect a few rough edges.


Known issues:
File dialogs aren't hildonized
When using the stylus keyboard the space key won't trigger the autoformating of bullets and urls, the tab key can be used instead.
Plugins that do not work: Insert Equation, Spell Checker, Version Control (there are no packages to provide the needed dependencies)
Tags cloud has low performance

Optional dependencies available in extras-devel:
These can be installed with apt-get or Application Manager
screenshot-tool (for Insert Screenshot plugin), graphviz (for Insert Diagram and Link Map plugins)

Other optional dependencies:
See the Garage homepage http://zim.garage.maemo.org