HtmlClean plug-in available
Well, let's give it a rip.
By popular demand, we now have a HtmlClean plug-in available which will clean and convert the HTML output from NewsGator into valid xhtml before posting. It works in conjunction with any other posting plug-in. This plug-in is available immediately for download.
[NewsGator News and Updates]
Update: Seems to work well. Doesn't get rid of Outlook's useless-span-itis, but it's valid and good, maybe a few extraneous tags won't kill me.