I've implemented nicEdit on my Question2Answer site, but I'm concerned by the comments to the original question. Cyclone & Dakota suggested that WYSIWYG could be messy in some browsers, causing users to focus more on formatting than the q&a.
Skrivener suggested partial WYSIWYG, and this is certainly possible in nicEdit by changing the calling parameters, though I have decided, for now at least, to use the full features.
So, if you have time, please can you try my Q&A section in different browsers (I've had no problem in Firefox, IE and Chrome). Please note that, to prevent spam, I've blocked anonymous posting. I will respect your email privacy.