Webcam software with two windows?

I have not tried either of these, but…

1)
Skype has screen sharing
http://www.skype.com/allfeatures/screensharing/

2)
Microsoft SharedView integrates with Windows Live Messenger.

“Microsoft SharedView is a fast, easy way to share documents and screen views with small groups of friends or coworkers”
http://connect.microsoft.com/content/content.aspx?ContentID=6415&SiteID=94

About using voice and video in Windows Live Messenger
http://help.live.com/help.aspx?project=wl_messengerv1_1&market=en-us&querytype=topic&query=messenger_conc_aboutusingaudioandvideoinwlmessenger.htm

I was hoping for some kind of software that could be used as webcam output for live streaming services such as Bambuser and Ustream

Broadcasting to multiple users, then. Not one-to-one. Is that right?

I was thinking a software that could both broadcast my desktop and my webcam at the same time – screencast and webcast, so to speak. Like desktop in a big window and a little window of me in webcam.

I was hoping someone would chime in with a better answer, but I guess not, so FWIW…

Ustream suggests WebCamMax for using multiple cameras in one stream.
http://helpcenter.ustream.tv/content/can-i-use-multiple-cameras-one-computerstream

WebCamMax has Picture in Picture and “Share your video clips or desktop screen”, so perhaps those can be combined.
http://www.webcammax.com/

Found Camtasia Studio and Jing Pro – two paid softwarez that do what I need. Thanks all!