The current CXP Archive Transcoder source is on GitHub
Project Description Archive Transcoder is a tool designed to post-process the SQL Server-resident ConferenceXP Archive Service conference and presentation data for streaming and off-line use.
There is also a custom client playback tool targeted for archives containing slides and TabletPC ink called CXP WebViewer. CodePlex: http://www.codeplex.com/CXPWebViewer.