Create a screencast video demonstration

Hi there, I need someone to a series of 8 videos to demonstrate of a software. The videos will be maximum 10 minutes long. The videos will be an over-the-shoulder screencast where we explain the features of a software to users. The video would be similar to this one [login to view URL] I am looking for someone with an excellent american/British accent and who is familiar with internet marketing related products. Please send over some samples of some software demo you created. Also include the passcode "purple cow" at the top of your application. All the best, Bertrand