Obvious question here... is there a sample project available to see how ORS is being used? I am interested in checking this out... :)
There are example projects attached to one of the blog posts: http://www.openriaservices.net/blog/post/The-Open-RIA-Services-Blog/1016/4-3-Alpha-NuGet-Packages-Released/
There are lots of existing examples, videos, blog posts, etc. for WCF RIA Services out there that should all apply to Open RIA Services as well. There is also the original WCF RIA Services documentation on MSDN at http://msdn.microsoft.com/en-us/library/ee707344(v=vs.91).aspx.
Hmmm... Downloading that project and trying to compile it produces a bunch of exceptions. You should consider creating a sample project from NuGet based on your latest libraries, ala the SignalR Team:
Also, when I visit this link that's mentioned in your above link:
It appears to be an empty an Xml document with empty elements (that is, there isn't much content). Is this supposed to be the case?