We recently released an updated version (220.127.116.11) of the Windows Mobile client, which brings progress on several fronts.
The most noticeable change in this version is the ability to rotate the user interface and the sent video, to support a wide range of devices, and to be able to send landscape instead of portrait video on more devices. You can find this under Settings in the application.
Secondly, this version has improved video encoding. The new codec is very well suited for low bandwidth conditions and will give you better flowing broadcasts when you select the lower video quality settings. The high quality setting will continue to use a simpler codec, for maximum detail and speed at the cost of bandwidth.
Additionally, the new version gives more informative feedback in case of connection problems and contains bugfixes for some other rare problems.