Adobe has announced that Flash Media Live Encoder 3.1 for Mac OS X is now a free download. You can grab it at http://blogs.adobe.com/flashmedia/2010/03/flash_media_live_encoder_31_fo_1.html .
Features include: the ability to perform up to three simultaneous encodes; saving to local file during encoding; auto-adjust (helps manage the stream quality to stay live under poor network conditions); and support for H.264 and VP6 codecs. Flash Media Live Encoder is designed for content owners who want to stream live events like concerts, sporting events, web casts, and news.