QuickTime Streaming Server (QTSS) can be installed without any problem even on MacOS X client. I know that this could be a stupid hint, but in every ReadMe about QTSS MacOS X Server 10.1 is required.
Checking the QTSS FAQ, I found that it's fully compatible with MacOS X Client, even if this configuration is not supported by Apple. The only disclaimer is that AppleCare does not support QTSS on OS X Client.
Mac OS X Hints
http://hints.macworld.com/article.php?story=20020215091306965