Once you have downloaded and installed Flip4Mac on your Mac, you can test the webcast ability with one of the following streams:
I've gotten both feeds to work on Firefox 3.6.12 but can only get the audio to work on Safari 5.0.3 on Mac OS 10.6.5.
At some point in the future it would be nice to be able to stream this content to an iPad, iPhone, or iPod Touch using HTTP Live Streaming
protocol instead of being stuck with WMV format. But as that protocol is still in development, I expect it will be some time before this becomes an option for webcasting stake conference and such.