I've been doing a bit of meddling recently with another WordPress blog and have found the need to pump up my rich text visual editor. Here are a couple rich text replacement editors I have found to currently be the most prominent. Please let me know if you have any other suggestions!
CKEditor
http://wordpress.ckeditor.com/
http://www.laptoptips.ca/projects/tinymce-advanced/
superb plugin for the wordpress to write more fancy
The default WordPress Editor is certainly inadequate.
The new plugin ultimate TinyMCE is even better than TinyMCE advanced, including more customisation. Check it out at the WordPress plugin directory http://wordpress.org/extend/plugins/ultimate-tinymce/