This is another small issue but I'm sure you'd like to know. When the video window is open during a call (and it's made quite large so as to extend near the main window) and you click on a contact to show the summary of the profile, the latter window is hidden under the video window and cannot be brought on top, nor can it be moved out of the way. This is easily reproducible and you might have noticed it already, but I thought I'd mention it anyway.
This also reminds me that the video window is only resizable by the lower-right corner (where the handle is) and that is not the most convenient approach. But I might be a little biased as I just completed a custom UI element and had to manually add sizing to it, and it took me quite an effort to make it be resizable by all four corners plus all sides (.Net 2.0). Anyway, just FYI.