I love this developer, they make very clean plugins and modules. I use a variety of their other mods. This one was exactly what I was looking for. Adds a little preview button to the top of the Edit Article page to see the edits IN YOUR TEMPLATE. What novel idea!? Would love to see them add some additional functions like rev control and drafts but for FREE this is perfect.
Running on J1.7.4 PHP 5.2.4 (They recommend PHP 5.3+)