Just blogged about the Silverlight/Flash hybrid microphone solution we're considering for the Tutor.com Classroom, if you're inclined to go that way. You'll need to use Flash Media Server if you want the conferencing aspect, but at least the bulk of your application can be in Silverlight with just the voice piece in Flash. Thanks, Russell Greenspan http://www.russellgreenspan.com http://russellgreenspan.blogspot.com/