I like the idea of using tiles pages to focus on task contexts by only showing relevant windows. However, often I have serval windows of the same application open, for example, several Acrobat PDFs or web pages as reference for different contexts such as "programming", "report writing", "procrastination". Ideally, I would like to create a tiles page "report writing" were I see only some of the PDF windows and web pages. But it seems currently tiles supports only to add applications not single windows, or have I missed how to do this? Otherwise this would be the #1 feature on my wishlist.