The SDK used to create the New York Times Reader (as an example) fomerly known as "Reader SDK" is now available as "Syndicated Client Starter Kit" from windowsclient.net: http://windowsclient.net/wpf/starter-kits/sce.aspx.

Get more information concerning the SDK from Tim Sneath: http://blogs.msdn.com/tims/archive/2008/01/16/we-ve-released-the-news-reader-sdk.aspx

I've tried the MSDN reader sample and was fairly impressed. Besides some problems in getting the content to my pc (might be based on problems with the Subscription Center) the reader worked very well and the layout is WPF par excellence.