I got an email the other day from Stephen Jazdzewski, a mojoPortal user running his site on Mono. 

He attended the Mix07 conference and mentioned mojoPortal in the QA session at the end of the Panel Discussion: Open Source Applications Using the .NET Platform.

The presentation is now online here. You can hear mojoPortal mentioned at about the 50:09 time reference.

Thanks a lot Stephen!, its great to get a little exposure at such an important event.