Ultimate Flash Bit Rate Calculator
http://www.adobe.com/devnet/flash/apps/flv_bitrate_calculator/
This is major useful for many folks because the Adobe Flash Bit Rate Calculator includes targeting information.
They include:
Video motion
Audio content
Flash Player targeted
HTTP vs RTMP delivery
It'll show you the appropriate video and audio codec
Spark, VP6 E and S, H.264
MP3 or AAC
You can select the frame size aspect ratio (there's the link to suggestions based on 4, 8, 16 block guideline)
It reports the video, audio, overall data rate and includes the recommended connection speed (taking overhead into account).
In addition, you can download the settings file for Squeeze or Flix (but not Episode yet).