I’ve spent a good deal of time looking into wysiwyg HTML editors widgets, and WYSIWYGPro is a really good one. I’ve checked out the open source / free offerings, and they’re just not up to snuff yet — FCKeditor, TinyMCE, BitFlux, Kupu, HTMLArea, SPAW — these are some of the main players.
For my own site, I’ve decided to shell out the $47 for WYSIWYGPro. I spent a large chunk of today figuring out how to integrate it into WordPress. If anyone is interested in the code, just ask and I’ll post a zip file.
Also, if anyone has had better experiences with the open source products above, I’d love to hear about it.