The only feature it seems to be missing is Ubuntu One synchronisation like with Tomboy, however, if you use the default Notes directory ( ~/Notes), you can synchronise this over Ubuntu One, as your notes as held in files in this folder.
Here is the list of default plugins (you may need to install dependencies of some):
Zim is extendible using plugins - such as the LaTeX plugin. Here is a quick screenshot demonstrating some of the features: It has a familiar 'notebook' layout with tabs. Zim supports rich text formatting, links between notes and to external resources, inline images and even LaTeX equations. Zim is a similar note taking application with wiki like features.
