Thumbnail, you mean a part of the text and eventually a small imagage and a link to the full article? That is actually standard procedure for a CMS like EE Please have a look at: Title_permalink http://expressionengine.com/docs/modules/weblog/variables.html , trunchtml http://utilitees.silenz.org/index.php/addons/software/trunchtml/ and Image Sizer plug-in. Or do you mean a thumbnail af the actually HTML page of the full article to click on? I do not know if it’s possible. Would be very interesting though…
Code must be embedded inside your exp:entree tags. If your item is repeating (likely on a index page with a limited numbers of entrees showing) you’ll use the Anonymous action (for the Validation) on the repeating HTML item and sometimes also the remove P tag action, depending on your set-up.
Inside the exp:entree tags you call whatever content you want, right? In this example a shrinked version of the image that gets called from {your_image_custom_field}.
You say: recent news stories. That’s a potential repeating element in the HTML output. (Not from FW of course, but the output from EE.) FW gives an ID to each and every HTML element. If they repeat, you end up with a page that does not validate. Walther wrote this Anonymous action, that strips the ID from the item. Very clever, because we do not need it here. Ergo, page validates!