If you are interested in what communication and serialization technologies are being used by others in Silverlight 2 applications, check out the post at http://tomasz.janczuk.org/2009/07/adoption-of-wcf-technologies-in.html. It is a summary of a research of over 700 actual Silverlight 2 applications conducted in February 2009. It compares the adoption numbers of several communication and serialization technologies, including WCF, in Silverlight 2 applications as well as provides basic analysis of backend service technology.

Tomasz Janczuk
Development Manager
WCF Team