NVu is a pretty good lightweight WYSIWYG HTML editor. It produces nice clean output without all that cruft that commercial products seem to insist on. But it lacks support for the BLOCKQUOTE tag. Which makes it a pain for me to use. [Yes, yes, I know that blockquote is deprecated in favor of style sheets. But it’s easy, and does exactly what I want to do when insetting quotes. And ‘deprecated’ doesn’t mean obsolete!]
Update: And I wish it had a spell checker too….