WCF : http://www.sajay.com/post/2006/08/03/Using-a-Session-in-WCF-through-AspNetCompatibility.aspx

Explains the way to make WCF from IIS and enable session

http://www.sajay.com/post/2006/08/03/Using-a-Session-in-WCF-through-AspNetCompatibility.aspx