The New York Times has developed a pretty cool windows client using the avalon Windows Presentation Framework in .Net Framework 3.0. The pp downloads the articles so that you can browse the news paper offline, it re-flows the content to intelligently display articles based on the size of the windows, has great search features, keeps read state, lets you annotate the articles save it off, etc. It's a pretty powerful demonstration of what new windows applications can be like. Right now it uses the free NyTimes registration. Check it out!