Encoder for Multi-bitrate Live Streaming

[Upminders]

In http://www.wowzamedia.com/forums/showthread.php?t=6467 it is said that

Multi-bitrate live streaming to Flash, the iPhone/iPod touch and Silverlight requires that you have an encoder that can generate multiple bitrate streams from the same source that are properly key-frame aligned. Once have you an encoder that can generate properly aligned streams

Could you please name a few encoders that will work with Wowza ?

[charlie]

Flash Media Live Encoder (carefully read the EULA), Telestream Wirecast (maybe), Haivision Makito and Barracuda.

Charlie