WCF TCP Port Sharing

Check this out. WCF allows you to share the same port among the services.

http://msdn.microsoft.com/en-us/library/ms734772.aspx
http://msdn.microsoft.com/en-us/library/ms731810.aspx

The article below has a diagram that depicts the port sharing:
http://www.codeproject.com/KB/WCF/Port_Sharing__in_WCF.aspx

Configuration:
http://blogs.msdn.com/b/drnick/archive/2006/04/14/configuring-http.aspx