tjanczuk

James,

scale out of the WCF service exposed with the http polling duplex binding in a web farm (Azure or otherwise) is challenging due to the internal design of the server side implementation. Check out http://tomasz.janczuk.org/2009/09/scale-out-of-silverlight-http-polling.html for more details on the topic.

Thanks,

Tomasz 

A sample chat application similar to the one shown in the video can be downloaded from http://tomasz.janczuk.org/2009/07/pubsub-sample-using-http-polling-duplex.html. More resources related to polling duplex are at my blog at http://tomasz.janczuk.org. 

Yosh,

I wonder which particular security features from WSHttpBinding you are interested in?

Yosh, 

Silverlight supports a good subset of BasicHttpBinding functionality. The major value add of WSHttpBinding over BasicHttpBinding is supoport for WS-Security and WS-ReliableMessaging. Given substantial demand, we are looking into enabling a subset of WS-Security capabilities in the future release of Silverlight. 

Thanks,

Tomasz Janczuk