The developer of Brynhildr has started work on a new Video Chat program called vs5x. Its first version was made the 2nd of this month and it now has a new version that has screen sharing added to it. You can read more info about the old version at http://blog.x-row.net/?p=16918 and the new version at http://blog.x-row.net/?p=16990. You can download it at http://blog.x-row.net/download/?file=vs5x&ver=011.
It turned out to be that it was missing RGB24 support (which was added in 0.1.3). It is now at 0.1.4 (which can be downloaded at http://blog.x-row.net/download/?file=vs5x&ver=014).