Telerik has just released RADControls for WPF. Check out the cool filtering options and the awesome RADCarousel. http://blogs.telerik.com/hristodeshev/posts/08-07-02/radcontrols_for_wpf_--_now_with_filtering_support.aspx
Check out the Telerik Sitefinity challenge and you could win a Zune or a free Sitefinity license!!! http://www.sitefinity.com/product/challenge.aspx