The folks over at Skype are hoping that you want to be a beta tester. Starting today, Skype 4.0 Beta 1 for Windows goes into public beta, and there are a number of significant changes in the new version. The most noticeable transformation from the existing client to the new beta is a much lager default video window for video calls. (Skype estimates that about 25 percent of current Skype users use the software’s video calling feature.) The user interface is being reworked a bit as well to make it easier to “resize