I was one of presenters at Microsoft community conference Kulendayz 2009 in Beli Manastir. I have presented there .NET Ria services. Here is my powerpoints and demos:
.Net Ria Services.pptx (768.70 kb)
Demos.rar (7.34 mb)
Most of content I have referenced from Nikhil's and Brad's presentation from Mix this year.