There is a great software from MX Light that allows you stream video using Black Magic's ATEM Television Studio and the H.264 Pro Recorder. This software currently only supports use with a PC platform but can be run on MAC using Parallels. As of now it is only for you with the ATEM Television Studio and the H.264 Pro Recorder from Blackmagic.
The ATEM is a great switcher and comes with some powerful software but using Black Magic's Media express software you can only record and not stream. MX Light allows you to do both.
It is currenlty compatible and has presents for: Ustream, LiveStream, Justin.TV, Dailymotion and Wowza.
Here is a list of the features for the software: MX Light Features