What you need?
A good understanding of C#. MCML and WPF are an advantage, but you can get a lot done with C# skills only. A copy of Visual Studio 2008 (any version will do, if you want to debug you will need professional version and above)
Where is the source code?
The source code lives on google code: http://code.google.com/p/videobrowser/source/checkout anyone can pull the latest copy off mercurial.
Make yourself familiar with the code, decide what part you would like to work on and shoot off an email to sam.saffron
<at>gmail.com asking to join the Dev team.