I hate MSDN\'s site for WCF RIA services. It does not say what it is, it only says what it does. It says what it can achieve but does not say why I need it.
For exa
The latest news: WCF RIA Services is dead:
http://blogs.msmvps.com/deborahk/who-moved-my-cheese-ria-services/
If you want to use RIA Services, they have been open sourced:
http://www.openriaservices.net/blog/posts/