There's good stuff at http://msdn.microsoft.com/en-us/netframework/cc950529.aspx

REST is all about XML. WCF is serialize the data from Datasets to XML for you.

>Hello
>
>Thanks for the reply
>
>Ok I am making headway as far as going to use WCF!
>It seems that SOAP is the old way so I will do so reasearch on REST. (do you have any example or documentation?)
>
>ALso what will be the best way to pass data between the client and the server using those tools?
>Exchanging XML or Dataobject or else?
>
>Thanks
>
>Xavier