Many client technologies such as Silverlight 2 only support the HTTP Methods GET and POST. However, you may want to follow a HI-REST architectural style when designing your RESTful APIs, taking advantage of additional HTTP methods such as PUT and DELETE
Read More...
Read the complete post at http://channel9.msdn.com/posts/RobBagby/decast-Tunneling-a-PUT-through-POST-with-RESTful-WCF-Services/