My only complaint about WordPress is that the default editor really really sucks. Fortunately the plugin architecture makes it possible to replace the editor with one of many options. I have started to use a wysiwyg editor I downloaded from Mudbomb and what a difference it makes. In addition to the improved editing interface, the plugin also enables posting via e-mail, which can be pretty handy when you are unable to access the web for whatever reason or on a blackberry.
Another plugin I am using is Ultimate Tag Warrior, it enables a simple text entry box on the editor where I can tag my posts, I have it setup for Technorati tags but there are many options.
Update: fixed the link.