In What I Like About Habari I noted that out of the box Habari doesn't have a wysiwyg editor. Everything is written in bare html.
That hasn't changed, but several plugins have appeared to allow you to write your posts in a wysiwyg editor.
The next is a plugin by Michael C. Harris using the popular TinyMCE editor that we all know from WordPress. TinyMCE is the heavyweight of the bunch, weighing in at 1.21MB. It is also the most versatile and complete. It comes with several plugins, including support for flash, skins, spellcheck, and smilies. TinyMCE opens a completely new window to view raw html source. An oddity about it is that the toolbar is on the bottom of the editor window, not the top.
None of these plugins are perfect. jwysiwyg, for example, isn't able to interact with Habari's media silos yet. Whether the other two do or not, I don't know. Neither jwysiwyg nor NicEdit are resizeable. TinyMCE can be configured to be resizeable. They all meet the basic requirements for a wysiwyg editor and adequately meet most needs.