<p>For months now I've been trying to find a code syntax formatting extension that works for BlogEngine.Net.  I'm not fond of the behavior of the default formatting extension, and have tried a couple of others (manoli is among them), but they always seem to interact badly with the TinyMCE editor.  Does anyone know of an extension that works, or a different approach that will allow me to make code samples pretty on my blog without hacking the crap out of the HTML myself?</p>

<p>Thanks.</p>

I would try using Windows Live Writer along w/ the Paste From Visual Studio plugin. One you go WLW, you'll never go back to that damn TinyMCE interface.
WLW here:
http://get.live.com/writer/overview
Plugin here:
http://gallery.live.com/liveItemDetail.aspx?li=d8835a5e-28da-4242-82eb-e1a006b083b9&l=8