I recently posted another WPF article to CodeProject. It is a revamped version of an old blog post. The article shows how to conditionally highlight ListViewItems, based on values in a DataTable. This article is quite different from the original blog post. My original approach went against the grain, the new approach flows with the way that WPF should be used.
Here’s a link to the article: http://www.codeproject.com/useritems/HiliteListViewItemsInWPF.asp